Summary of experience using jquery_jquery-JS Tutorial-php.cn

Summary of experience using jquery_jquery

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Release： 2016-05-16 15:58:27

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1. Today I found that in addition to the jquery object, the dom object obtained by jquery can also access the original object. Just add a []. It turns out that there is such a function, but I didn't study it carefully before.

2, use first-child, nth-child(n) to get the first element in the element set.

3. Use Jquery to access the nodeText node by accessing the original object and nextSibling. The access is nextSibling.nodeValue;

<!DOCTYPE HTML>
<html>
 <head>
  <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
  <title>Zephyr's Document</title>
  <script src="http://common.cnblogs.com/script/jquery.js"></script>
  <style type="text/css" media="screen">
  /*<![CDATA[*/
 
  /*]]>*/
  </style>
  <script type="text/javascript">
  $(function(){
  var tempBr=$("br");
  tempBr.each(function(index,doElem){
    doElem.nextSibling.nodeValue=doElem.nextSibling.nodeValue.replace(/\s{6}/g,"");
  })})
  </script>
  </head>
  <body>
  asdf
    <br />
    "   asdf"
    <br />
    "   asdf"
    <br />
    "   asdf"
  </body>
</html>

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4.DOM object and jQuery object conversion

The code to obtain the DOM object is as follows:

//获取DOM对象
var div1 = document.getElementById("div1");
div1.innerHTML = "oec2003";

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The code to obtain the jQuery object is as follows:

//获取jQuery对象
var div1 = $("#div1");
div1.html("oec2003");

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jQuery object to DOM object

//因为ajQuery对象是一个数组对象，所以转换为DOM对象时要用索引的形式
var $div1 = $("#div1"); //jQuery对象
var div1 = $div1[0]; //转换为了DOM对象
var div2 = $div1.get(0); //和上面一行效果一样
div1.innerHTML = "oec2003";

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DOM object to jQuery object

//DOM对象转jQuery只需用$包装即可
var div1 = document.getElementById("div1");
var $div1 = $(div1); //转换为了jQuery对象
$div1.html("oec2003");

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5. Resolve conflicts

Sometimes there are scenarios where jQuery is used together with other libraries or some public script files written by yourself, and there may be a $ conflict problem. There are two situations to resolve the conflict:

1. The jQuery library is referenced after other libraries, as shown below:

Copy code The code is as follows:

There is a redefinition of $ in common.js, the code is as follows:

function $(id) {

  return document.getElementById(id);
}

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The following is the code to resolve conflicts in jQuery. There are four ways:

//方式1
jQuery.noConflict(); //将$控制权移交出去，以前使用$的地方都改用jQuery
jQuery(document).ready(function () {
  alert(jQuery("#span1").html());
});
window.onload = function () {
  $("span1").innerHTML = "oec2003";
}

//方式2
var $j=jQuery.noConflict(); //定义快捷方式
$j(document).ready(function () {
  alert($j("#span1").html());
});

window.onload = function () {
  $("span1").innerHTML = "oec2003";
}

//方式3
jQuery.noConflict(); //在函数内部继续使用$
jQuery(function ($) {
  alert($("#span1").html());
});
window.onload = function () {
  $("span1").innerHTML = "oec2003";
}

//方式4
jQuery.noConflict(); //在函数内部继续使用$另一种方式
(function ($) {
  $(function(){
    alert($("#span1").html());
  });
})(jQuery);
window.onload = function () {
  $("span1").innerHTML = "oec2003";
}

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2. Use jQuery library before other libraries

//如果先引用jQuery脚本，可以不使用noConflict
//jQuery.noConflict(); 
jQuery(document).ready(function () {
  alert(jQuery("#span1").html());
});
window.onload = function () {
  $("span1").innerHTML = "oec2003";
}

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