JS限制并且显示textarea字数

转自：https://www.cnblogs.com/shinepolo/articles/1373113.html
 1 <script type="text/javascript">
 2 
 3      function show(a,b) {
 4                 var maxl = 400
 5         var s = document.getElementById(a).value.length + 1;
 6         if (s > maxl)
 7             document.getElementById(a).value = document.getElementById(a).value
 8                     .substr(0, maxl - 1)
 9         else
10             document.getElementById(b).innerHTML = "已输入：" + s + "/" + maxl
11                     + " 字符"
12        }
13 </script>
14 
15 
16 <s:textarea onkeydown="show();" id="a"></s:textarea>
17 <div><span id ="b">已输入字符：</span></div>

posted on 2016-07-01 11:34 Sharpest 阅读(384) 评论(0) 编辑收藏举报