JQ判断是否是数字或者小数，并精确到小数点后两位 

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Untitled Page</title>
    <script src="http://code.jquery.com/jquery-1.11.1.min.js" type="text/javascript"></script>
</head>
<body>
<input id="txt_num" type="text" />
<input id="btn_submit" type="button" value="提交" />
<script type="text/javascript">
$(function () {
    $("#btn_submit").click(function(){
        var num = $("#txt_num").val();
        if(!isNaN(num)){
            var dot = num.indexOf(".");
            if(dot != -1){
                var dotCnt = num.substring(dot+1,num.length);
                if(dotCnt.length > 2){
                    alert("小数位已超过2位！");
                }
            }
        }else{
            alert("数字不合法！");
        }
    });
});
</script>
</body>
</html>

 

posted @ 2017-10-13 21:35  智昕  阅读(4406)  评论(0)    收藏  举报