javascript的数组方法push说明

 1 <!doctype html>
 2 <meta charset="utf-8">
 3 <body>
 4     <input type="checkbox" value="1" name="check" checked="checked"/>
 5     <input type="checkbox" value="1" name="check"/>
 6     <input type="checkbox" value="1" name="check" checked="checked"/>
 7     <input type="checkbox" value="1" name="check" />
 8     <input type="button" value="你选中的个数" id="btn" />
 9     <script>
10 
11        var btn=document.getElementById('btn');
12        btn.onclick=function(){
13          var arrays=new Array();
14          var checkitem=document.getElementsByName("check");
15          for(var i=0;i<checkitem.length;i++)
16          {
17              if(checkitem[i].checked){
18                  arrays.push(checkitem[i].value);//将（）里面的值传入arrays数组中
19              }
20          }
21          alert(arrays.length)
22        }
23 
24     </script>
25     </body>
if you don't try,you will never know!