js 验证字符长度 

 1     <script language="javascript" type="text/javascript">
 2       
 3 function getLength(str) {
 4     var len = str.length;
 5     var reLen = 0;
 6     for (var i = 0; i < len; i++) {        
 7         if (str.charCodeAt(i) < 27 || str.charCodeAt(i) > 126) {
 8             // 全角    
 9             reLen += 2;
10         } else {
11             reLen++;
12         }
13     }
14     return reLen;    
15 } 
16 
17 
18          
19     
20      
21        function ChkFrm() {
22 
23 
24            var txtTrueName = document.getElementById("TxtTitle");  //用户姓名
25            if (getLength(txtTrueName.value) > 6) {
26                alert("长度不能小于6");
27                txtTrueName.focus();
28                return false;
29            }
30 return true;
31 }
32 </script>
posted @ 2011-05-25 09:09  style_life  阅读(1266)  评论(0)    收藏  举报