<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>textarea 限制字数</title>
<style>
.container{
position: relative;
width: 730px;
}
.container span{
position: absolute;
bottom: 20px;
right: 30px;
}
</style>
</head>
<body>
<div class="container">
<textarea name="content" id="content" cols="100" rows="10"></textarea>
<span>0/200</span>
</div>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.js"></script>
<script>
$(function(){
/**
* textarea 限制输入字数
* @param string str 类名或ID
* @param number num 限制输入的字数
*/
function limitImport(str,num){
$(document).on('input propertychange',str,function(){
var self = $(this);
var content = self.val();
if (content.length > num){
self.val(content.substring(0,num));
}
self.siblings('span').text(self.val().length+'/'+num);
});
}
//用法示例
limitImport('#content',200);
})
</script>
</body>
</html>
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