jQuery universal global traversal method $.each() usage example

The example in this article describes the usage of jQuery’s universal global traversal method $.each(). Share it with everyone for your reference, the details are as follows:

1.test.json file code:

[
 {
  "username": "张三",
  "content": "沙发."
 },
 {
  "username": "李四",
  "content": "板凳."
 },
 {
  "username": "王五",
  "content": "地板."
 }
]

2.html code:

<p>
<input type="button" id="send" value="加载"/>
</p>
<div class="comment">已有评论：</div>
<div id="resText" ></div>

3.jQuery code:

<script src="jquery-1.3.1.js" type="text/javascript"></script>
<script type="text/javascript">
/*
1.$.each()是jquery的一个通用的遍历方法，可用于遍历对象和数组
2.$.each()函数不同于jquery对象的each()方法，它是一个全局函数，不操作jquery对象，而是以一个数组或者对象作为第一个参数，以一个回调函数作为第二个参数。回调函数拥有两个参数：第一个参数为对象的成员或数组的索引，第二个参数为对应变量或内容
*/
$(function(){
    $(&#39;#send&#39;).click(function() {
       $.getJSON(&#39;test.json&#39;, function(data) {
         $(&#39;#resText&#39;).empty();
         var html = &#39;&#39;;
         $.each( data , function(commentIndex, comment) {
           html += &#39;<div class="comment"><h6>&#39; + comment[&#39;username&#39;] + &#39;:</h6><p class="para">&#39; + comment[&#39;content&#39;] + &#39;</p></div>&#39;;
         })
         $(&#39;#resText&#39;).html(html);
      })
    })
})
</script>

I hope this article will be helpful to everyone in jQuery programming.

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