记录一下，就直接贴代码了。

兴趣：<input type="checkbox" name="happys" value="打篮球" id="checkb1" >打篮球
        <input type="checkbox" name="happys" value="踢足球" id="checkb2">踢足球
        <input type="checkbox" name="happys" value="羽毛球" id="checkb3">羽毛球
        <input type="checkbox" name="happys" value="游泳" id="checkb4">游泳
        <input type="checkbox" name="happys" value="跑步" id="checkb5">跑步<br>
        <input type="hidden" value="${stu.happy}" id="happys">

<script type="text/javascript">
    $(function () {
       var arry = new Array();
       /*截取字符串 生成数组*/
       arry=$("#happys").val().split(",");
         for (var i=0;i<=arry.length;i++){
           if (arry[i]=="打蓝球"){
                $("#checkb1").attr("checked","true");
           }else if (arry[i]=='踢足球'){
                $("#checkb2").attr("checked","true");
           }else if (arry[i]=='羽毛球'){
               $("#checkb3").attr("checked","true");
           }else if (arry[i]=='游泳'){
               $("#checkb4").attr("checked","true");
           }else if (arry[i]=='跑步'){
               $("#checkb5").attr("checked","true");
           }
       }
    });
</script>