java Html&JavaScript面试题：HTML 的 f…

2018-06-24 01:28:00来源：未知阅读 ()

提交的验证方法（通过单个字符比较）：

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    VerifyDate
    <form id="form1" action="VefifyData.html">
        <input type="text" name="d1" /> <input type="submit" />
    </form>

    <script type="text/javascript">
        document.getElementById("form1").onsubmit = function chkForm() {
            var text = this.d1.value;
            alert(text.length);
            for (i=0;i<text.length;i++) {
                alert(i+"的字符是"+text.charAt(i));
                if (text.charAt(i) > '9' || text.charAt(i) < '0') {
                    alert("第 " + i + " 个为非数字字符 "+text.charAt(i));
                } else {
                    alert("第 " + i + " 个为数字字符"+text.charAt(i));
                }
            }
            return false;
        }
    </script>
</body>
</html>

提交验证方法（通过正则表达式）

js中用pattern.test(需要验证字符串) pattern是正则表达式

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    VerifyDate
    <form id="form1" action="VefifyData.html">
        <input type="text" name="d1" /> <input type="submit" />
    </form>

    <script type="text/javascript">
        document.getElementById("form1").onsubmit = function chkForm() {
            var text = this.d1.value;
            if(verifyData(text)){
                alert("全部为数字...");
                return false;
            }else{
                alert("不全部为数字...");
                return false;
            };
        }
        function verifyData(text){
            var dataPattern=/^\d[0-9]{0,}$/;
            return dataPattern.test(text);
        }
    </script>
</body>
</html>

提交之前验证的方法

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    VerifyDate
    <form id="form1" action="http://www.cnblogs.com/qingyundian" onsubmit="return chkForm()">
        <input type="text" id="d1" /> <input type="submit" />
    </form>

    <script type="text/javascript">
        function chkForm() {
            var text = document.getElementById("d1").value;
            alert(text);
            if(verifyData(text)){
                alert("全部为数字...");
                alert("校验成功，之后进行提交...");
                return true;
            }else{
                alert("不全部为数字...");
                alert("校验失败，不进行提交");
                return false;
            }
            return false;
        }
        function verifyData(text){
            var dataPattern=/^\d[0-9]{0,}$/;
            return dataPattern.test(text);
        }
    </script>
</body>
</html>