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Commonly used filtering methods in jquery

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Release: 2018-06-29 11:42:06
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Filtering methods, that is, functions, are mostly consistent with the filter functions introduced earlier

1: get() converts the jquery object into a DOM object: sets the foreground color of the second text Is red

$('li').get(1).style.color = 'red'
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2.eq(): Gets the element with the specified serial number. Note that the returned object is a jQuery object

$('li').eq(4).css('color','red')
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3.first(): Returns the first element, no parameters are required

$('li').first().css('color','red')
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4.first(): Returns the last element, no parameters are required

$('li').last().css('color','red')
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5.toArray(), returns a DOM array, note that it is not a jquery object

var li = $('li').toArray()
for(var i=0; i<li.length; i++){
li[i].style.color = &#39;green&#39;
}
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6 .find(): Returns all descendant elements, including children and grandchildren...

$(&#39;ul&#39;).find(&#39;li&#39;).css(&#39;color&#39;,&#39;coral&#39;)
$(&#39;ul&#39;).find(&#39;a&#39;).css(&#39;color&#39;,&#39;cyan&#39;)
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7.children() returns all direct child elements

$(&#39;ul&#39;).children().css(&#39;color&#39;,&#39;deeppink&#39;)
$(&#39;ul&#39;).children(&#39;p&#39;).css(&#39;color&#39;,&#39;deeppink&#39;)
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8. Execute for each element Callback function

$(&#39;li&#39;).each(function(){
$(this).css(&#39;background-color&#39;,&#39;wheat&#39;)
$(this).css(&#39;color&#39;,&#39;black&#39;)
$(this).css(&#39;font-size&#39;,&#39;1.3em&#39;)
})
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9. Element traversal method

//next()The next sibling element

$(&#39;li&#39;).eq(2).next().css(&#39;color&#39;,&#39;blue&#39;)
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//All sibling elements after nextAll()

$(&#39;li&#39;).eq(2).nextAll().css(&#39;color&#39;,&#39;blue&#39;)
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//siblings(): Returns all sibling elements of the selected element, except itself

$(&#39;li&#39;).eq(2).siblings().css(&#39;color&#39;,&#39;blue&#39;)
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Traverse forward

//prev(): Previous sibling Element

$(&#39;li&#39;).removeAttr(&#39;style&#39;)
$(&#39;li&#39;).eq(6).prev().css(&#39;color&#39;,&#39;coral&#39;)
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//prevAll(): You must have guessed, yes, it is all the previous sibling elements

$(&#39;li&#39;).eq(6).prevAll().css(&#39;color&#39;,&#39;coral&#39;)
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10. add(selector) , add elements to the selected collection

//First remove the custom styles on all elements, return the elements to their prototypes, and look plain

$(&#39;*&#39;).removeAttr(&#39;style&#39;)
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//Set all li text is red, you will find that there is a p that is not selected, which is normal

$(&#39;li&#39;).css(&#39;color&#39;,&#39;red&#39;)
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//So how can you select the p element? You can only increase the selection area and put the p element into this selection.

//You can do this using the add() method

$(&#39;li&#39;).add(&#39;p&#39;).css(&#39;color&#39;,&#39;red&#39;)
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11. filter() returns qualified elements from the result

//Only returns the 6th one Element

$(&#39;li&#39;).filter(&#39;:eq(5)&#39;).css(&#39;background-color&#39;,&#39;lightgreen&#39;)
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12. The function of not() is exactly the opposite of filter(). It removes the elements that meet the conditions

$(&#39;li&#39;).not(&#39;:eq(5)&#39;).css(&#39;background-color&#39;,&#39;lightgreen&#39;)
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13. slice(start, end), returns the elements in the specified range

$(&#39;*&#39;).removeAttr(&#39;style&#39;)
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//Including the starting position, excluding the end position, the number of results returned is 5-2=3

$(&#39;li&#39;).slice(2,5).css(&#39;background-color&#39;,&#39;lightgreen&#39;)
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//Get the first 4 elements

$(&#39;li&#39;).slice(0,4).css(&#39;background-color&#39;,&#39;lightgreen&#39;)
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//Omitted The second parameter defaults from the current beginning to the end

$(&#39;li&#39;).slice(4).css(&#39;background-color&#39;,&#39;lightgreen&#39;)
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