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JQuery changes attributes JQ object loop each select all inverse selection ternary operation

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Jul 14, 2017 pm 06:10 PM

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JQuery changes attributes JQ object loop each select all inverse selection ternary operation

<span style="color: rgb(0, 0, 255);"><span style="color: rgb(255, 0, 255);">doctype html</span><span style="color: rgb(0, 0, 255);">></span>
<span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">html </span><span style="color: rgb(255, 0, 0);">lang</span><span style="color: rgb(0, 0, 255);">="en"</span><span style="color: rgb(0, 0, 255);">></span>
<span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">head</span><span style="color: rgb(0, 0, 255);">></span>
    <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">meta </span><span style="color: rgb(255, 0, 0);">charset</span><span style="color: rgb(0, 0, 255);">="UTF-8"</span><span style="color: rgb(0, 0, 255);">></span>
    <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">meta </span><span style="color: rgb(255, 0, 0);">name</span><span style="color: rgb(0, 0, 255);">="viewport"</span><span style="color: rgb(255, 0, 0);">
          content</span><span style="color: rgb(0, 0, 255);">="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"</span><span style="color: rgb(0, 0, 255);">></span>
    <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">meta </span><span style="color: rgb(255, 0, 0);">http-equiv</span><span style="color: rgb(0, 0, 255);">="X-UA-Compatible"</span><span style="color: rgb(255, 0, 0);"> content</span><span style="color: rgb(0, 0, 255);">="ie=edge"</span><span style="color: rgb(0, 0, 255);">></span>
    <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">title</span><span style="color: rgb(0, 0, 255);">></span>Document<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">title</span><span style="color: rgb(0, 0, 255);">></span>
<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">head</span><span style="color: rgb(0, 0, 255);">></span>
<span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">body</span><span style="color: rgb(0, 0, 255);">></span>
    <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">table </span><span style="color: rgb(255, 0, 0);">border</span><span style="color: rgb(0, 0, 255);">="1"</span><span style="color: rgb(0, 0, 255);">></span>
        <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">thead</span><span style="color: rgb(0, 0, 255);">></span>
            <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">tr</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">th</span><span style="color: rgb(0, 0, 255);">></span>选项<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">th</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">th</span><span style="color: rgb(0, 0, 255);">></span>ip<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">th</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">th</span><span style="color: rgb(0, 0, 255);">></span>port<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">th</span><span style="color: rgb(0, 0, 255);">></span>
            <span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">tr</span><span style="color: rgb(0, 0, 255);">></span>
        <span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">thead</span><span style="color: rgb(0, 0, 255);">></span>
        <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">tbody </span><span style="color: rgb(255, 0, 0);">id</span><span style="color: rgb(0, 0, 255);">="i1"</span><span style="color: rgb(0, 0, 255);">></span>
            <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">tr </span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">><span style="color: rgb(128, 0, 0);">input </span><span style="color: rgb(255, 0, 0);">type</span><span style="color: rgb(0, 0, 255);">="checkbox"</span><span style="color: rgb(0, 0, 255);">></span><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>1.1.1.1<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>80<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>
            <span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">tr</span><span style="color: rgb(0, 0, 255);">></span>
            <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">tr</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">><span style="color: rgb(128, 0, 0);">input </span><span style="color: rgb(255, 0, 0);">type</span><span style="color: rgb(0, 0, 255);">="checkbox"</span><span style="color: rgb(0, 0, 255);">></span><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>1.1.1.1<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>80<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>
            <span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">tr</span><span style="color: rgb(0, 0, 255);">></span>
                    <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">tr</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">><span style="color: rgb(128, 0, 0);">input </span><span style="color: rgb(255, 0, 0);">type</span><span style="color: rgb(0, 0, 255);">="checkbox"</span><span style="color: rgb(0, 0, 255);">></span><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>1.1.1.1<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>80<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>
            <span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">tr</span><span style="color: rgb(0, 0, 255);">></span>
                    <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">tr</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">><span style="color: rgb(128, 0, 0);">input </span><span style="color: rgb(255, 0, 0);">type</span><span style="color: rgb(0, 0, 255);">="checkbox"</span><span style="color: rgb(0, 0, 255);">></span><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>1.1.1.1<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>
                <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>80<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">td</span><span style="color: rgb(0, 0, 255);">></span>
            <span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">tr</span><span style="color: rgb(0, 0, 255);">></span>
        <span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">tbody</span><span style="color: rgb(0, 0, 255);">></span>
    <span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">table</span><span style="color: rgb(0, 0, 255);">></span>
    <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">input </span><span style="color: rgb(255, 0, 0);">type</span><span style="color: rgb(0, 0, 255);">="button"</span><span style="color: rgb(255, 0, 0);"> value</span><span style="color: rgb(0, 0, 255);">="all"</span><span style="color: rgb(255, 0, 0);"> onclick</span><span style="color: rgb(0, 0, 255);">="checkAll()"</span><span style="color: rgb(0, 0, 255);">></span>
    <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">input </span><span style="color: rgb(255, 0, 0);">type</span><span style="color: rgb(0, 0, 255);">="button"</span><span style="color: rgb(255, 0, 0);"> value</span><span style="color: rgb(0, 0, 255);">="rev"</span><span style="color: rgb(255, 0, 0);"> onclick</span><span style="color: rgb(0, 0, 255);">="reverse()"</span><span style="color: rgb(0, 0, 255);">></span>
    <span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">input </span><span style="color: rgb(255, 0, 0);">type</span><span style="color: rgb(0, 0, 255);">="button"</span><span style="color: rgb(255, 0, 0);"> value</span><span style="color: rgb(0, 0, 255);">="can"</span><span style="color: rgb(255, 0, 0);"> onclick</span><span style="color: rgb(0, 0, 255);">="checkNone()"</span><span style="color: rgb(0, 0, 255);">></span>
<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">body</span><span style="color: rgb(0, 0, 255);">></span>
<span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">script </span><span style="color: rgb(255, 0, 0);">src</span><span style="color: rgb(0, 0, 255);">="jquery-3.2.1.js"</span><span style="color: rgb(0, 0, 255);">></span>
<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">script</span><span style="color: rgb(0, 0, 255);">></span>
<span style="color: rgb(0, 0, 255);"><span style="color: rgb(128, 0, 0);">script</span><span style="color: rgb(0, 0, 255);">></span>
    <span style="color: rgb(0, 0, 255); background-color: rgb(245, 245, 245);">function</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);"> checkAll () {
        $(</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">#i1 input</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">).prop(</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">checked</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">, </span><span style="color: rgb(0, 0, 255); background-color: rgb(245, 245, 245);">true</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">)
</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">//</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">        $(':checkbox').prop('checked', true)</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">
//</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">        实际上, 这两条都是一样的.$带出的JQuery对象只能是列表, 且是标签列表.</span>
<span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">    }
    </span><span style="color: rgb(0, 0, 255); background-color: rgb(245, 245, 245);">function</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);"> checkNone () {
        $(</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">#i1 input</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">).prop(</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">checked</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">,</span><span style="color: rgb(0, 0, 255); background-color: rgb(245, 245, 245);">false</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">)
    }
</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">//</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">    function reverse() {</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">
//</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">        $('#i1 input').each(function (k) {</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">
//</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">            console.log(k,this);</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">
//</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">        })</span>
    <span style="color: rgb(0, 0, 255); background-color: rgb(245, 245, 245);">function</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);"> reverse() {
    $(</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">#i1 input</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">).each(</span><span style="color: rgb(0, 0, 255); background-color: rgb(245, 245, 245);">function</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);"> () {
        </span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">//</span><span style="color: rgb(0, 128, 0); background-color: rgb(245, 245, 245);">三元运算, 实现反选, 选中的不选, 没选的选中</span>
        <span style="color: rgb(0, 0, 255); background-color: rgb(245, 245, 245);">var</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);"> v </span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">=</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);"> (</span><span style="color: rgb(0, 0, 255); background-color: rgb(245, 245, 245);">this</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">).prop(</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">checked</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">)</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">?</span><span style="color: rgb(0, 0, 255); background-color: rgb(245, 245, 245);">false</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">:</span><span style="color: rgb(0, 0, 255); background-color: rgb(245, 245, 245);">true</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">;
        $(</span><span style="color: rgb(0, 0, 255); background-color: rgb(245, 245, 245);">this</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">).prop(</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">checked</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">'</span><span style="color: rgb(0, 0, 0); background-color: rgb(245, 245, 245);">,v)
    })
    }
</span><span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">script</span><span style="color: rgb(0, 0, 255);">></span>
<span style="color: rgb(0, 0, 255);"></span><span style="color: rgb(128, 0, 0);">html</span><span style="color: rgb(0, 0, 255);">></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

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In the inverse selection, we do not need to use a for loop, but use the encapsulated .each(function(k){})

The parameter k of the function in

.each is actually a subscript (index number)

<span style="color: rgb(0, 0, 255);">function</span><span style="color: rgb(0, 0, 0);"> reverse() {
        $(</span>'#i1 input').each(<span style="color: rgb(0, 0, 255);">function</span><span style="color: rgb(0, 0, 0);"> (k) {
            console.log(k,</span><span style="color: rgb(0, 0, 255);">this</span><span style="color: rgb(0, 0, 0);">);
        })</span>

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The output results include:

k : 0 1 2 3

this: Each input sub-tag in all inputs needs to be looped, and all this is actually a DOM object instead of a JQ object

JQuery changes attributes JQ object loop each select all inverse selection ternary operation

If you want to convert this into a JQ object, you need to wrap it with $(this)

Ternary operations:

var v = condition? true value: false value

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Title: jQuery Tips: Quickly modify the text of all a tags on the page In web development, we often need to modify and operate elements on the page. When using jQuery, sometimes you need to modify the text content of all a tags in the page at once, which can save time and energy. The following will introduce how to use jQuery to quickly modify the text of all a tags on the page, and give specific code examples. First, we need to introduce the jQuery library file and ensure that the following code is introduced into the page: &lt

Use jQuery to modify the text content of all a tags Feb 28, 2024 pm 05:42 PM

Title: Use jQuery to modify the text content of all a tags. jQuery is a popular JavaScript library that is widely used to handle DOM operations. In web development, we often encounter the need to modify the text content of the link tag (a tag) on the page. This article will explain how to use jQuery to achieve this goal, and provide specific code examples. First, we need to introduce the jQuery library into the page. Add the following code in the HTML file:

What is the difference between arrays and objects in PHP? Apr 29, 2024 pm 02:39 PM

In PHP, an array is an ordered sequence, and elements are accessed by index; an object is an entity with properties and methods, created through the new keyword. Array access is via index, object access is via properties/methods. Array values are passed and object references are passed.

How do PHP functions return objects? Apr 10, 2024 pm 03:18 PM

PHP functions can encapsulate data into a custom structure by returning an object using a return statement followed by an object instance. Syntax: functionget_object():object{}. This allows creating objects with custom properties and methods and processing data in the form of objects.

What should I pay attention to when a C++ function returns an object? Apr 19, 2024 pm 12:15 PM

In C++, there are three points to note when a function returns an object: The life cycle of the object is managed by the caller to prevent memory leaks. Avoid dangling pointers and ensure the object remains valid after the function returns by dynamically allocating memory or returning the object itself. The compiler may optimize copy generation of the returned object to improve performance, but if the object is passed by value semantics, no copy generation is required.

PHP returns all the values in the array to form an array Mar 21, 2024 am 09:06 AM

This article will explain in detail how PHP returns all the values of an array to form an array. The editor thinks it is quite practical, so I share it with you as a reference. I hope you can gain something after reading this article. Using the array_values() function The array_values() function returns an array of all the values in an array. It does not preserve the keys of the original array. $array=["foo"=>"bar","baz"=>"qux"];$values=array_values($array);//$values will be ["bar","qux"]Using a loop can Use a loop to manually get all the values of the array and add them to a new

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