javascript实现文本框标签验证的实例代码
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2022-05-25 22:25:51
具体代码如下所述：
< !doctype html >
具体代码如下所述：
< !doctype html > <html lang = "en" > <head > <meta charset = "utf-8" > <title > document < /title>
</head > <style type = "text/css" > body {
background: #ccc;
}
label {
width: 100px;
display: inline - block;
}
span {
color: red;
}.container {
margin: 100px auto;
width: 400px;
padding: 50px;
line - height: 40px;
}
span {
margin - left: 30px;
font - size: 12px;
} < /style>
<body>
<div class="container">
<label>姓名不能为空</label > <input type = "text"id = "inp1" > <span > </span><br/ > <label > phone不能为空 < /label><input type="text" id="inp2"><span></span > <br / ></div>
<script>
/ / 失去焦点后判断用户输入是否为空
var inp1 = document.getelementbyid("inp1");
inp1.onblur = function() {
if (trim(this.value) === "") {
alert("输入不能为空");
} else {
alert("输入正确");
}
};
function trim(str) {
return str.replace(/^\s+|\s+$/g, "");
}
var inp2 = document.getelementbyid("inp2");
inp2.onblur = function(e) {
if (inp2.value == "4444") {
alert("正确");
e.stoppropagation();
} else {
alert("错误")
}
}; < /script>
</body >
</html>
总结
以上所述是小编给大家介绍的javascript实现文本框标签验证的实例代码，希望对大家有所帮助