js相关1.设置下拉框只读2.判断两个数组是否相等3.form表单取值

来源：互联网发布：云计算工程师发展前景编辑：程序博客网时间：2024/05/16 11:41

1.设置选中下拉框只读

    <option>bbb</option>
    <option>aaa</option>
    <option selected>ccc</option>
</select>
<script type="text/javascript">
SetReadOnly(document.getElementById("select"));
   function SetReadOnly(obj){
        if(obj){
            obj.onbeforeactivate = function(){return false;};
            obj.onfocus = function(){obj.blur();};
            obj.onmouseover = function(){obj.setCapture();};
            obj.onmouseout = function(){obj.releaseCapture();};
        }
   }

</script>

2.判断两个数组是否相等

<body>
<div id="mydiv">
</div>
</body>
<script type="text/javascript">
   var arrayone = ["11","3","5"];
   var arraytwo = ["1",3,5];
   var compare = function(arrayone,arraytwo){
       if(arrayone!=null&&arrayone.length>0&&arraytwo!=null&&arraytwo.length>0&&arrayone.length===arraytwo.length){
           for(var i=0;i<arraytwo.length;i++){
               if(arrayone.indexOf(arraytwo[i])===-1){
                       //alert("两个数组不相等!");
                       document.getElementById("mydiv").innerHTML="两个数组不相等!";
                       return false;
               }
           }
       }
   }
//调用
compare(arrayone,arraytwo);
</script>

3.form表单通过id为name属性赋值

注意如果name值为name时会报undefined错误.使用时注意

function myFunction(){
       myform.username.value = username.value;
       alert(myform.username.value);
       //alert("aaa");
   }

</script>

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