JavaScript实现全选，全不选等效果。。。

<!DOCTYPE html>

<html>

  <head>

    <title>JavaScript全选练习</title>

    <meta http-equiv="content-type" content="text/html; charset=UTF-8">

    <script type="text/javascript" >

        function chooseAll()//全选

        {

            var a=document.getElementsByName("box");

            for(var i=0;i<a.length;i++)

            {

                a[i].checked=true;

            }

        }

        function chooseNo()//全不选

        {

            var a=document.getElementsByName("box");

            for(var i=0;i<a.length;i++)

            {

                a[i].checked=false;

            }

        }

        function chooseRe()//反选

        {

            var a=document.getElementsByName("box");

            for(var i=0;i<a.length;i++)

            {

                if(a[i].checked==false) a[i].checked=true;

                else a[i].checked=false;

            }

        }

        function chooseAllNo()//全选、全不选

        {

            var a=document.getElementsByName("box");

            var b=document.getElementById("abox");

            if(b.checked==true)

            {

                for(var i=0;i<a.length;i++)

                {

                    a[i].checked=true;

                }

            }

            else

            {

                for(var i=0;i<a.length;i++)

                {

                    a[i].checked=false;

                }

            }

        }

    </script>

  </head>

  <body>

      <input type="checkbox" id="abox" onclick="chooseAllNo();">全选/全不选<br>

      <input type="checkbox" name="box">张三<br>

      <input type="checkbox" name="box">李四<br>

      <input type="checkbox" name="box">王五<br>

      <input type="checkbox" name="box">赵六<br>

      <input type="button" value="全选" onclick="chooseAll();"/>

      <input type="button" value="全不选"  onclick="chooseNo();"/>

      <input type="button" value="反选"  onclick="chooseRe();"/>

  </body>

</html>

运行示意：

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