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  • JavaScript:验证输入

    <!DOCTYPE html>
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <meta charset="utf-8" />
    <script src="jQuery/jquery-2.2.0.min.js"></script>
    <script src="bootstrap/js/bootstrap.min.js"></script>
    <link rel="stylesheet"href="bootstrap/css/bootstrap.min.css" />
    </head>
    <body>
    <div class="container"style="padding:50px">
    <h3>JavaScript:验证输入</h3>
    <p>请输入数字。如果输入值不是数字,浏览器会弹出提示框。</p>
    <input type="text" id="demo"/>
    <hr />
    <button class="btn btn-primary"onclick="myFunction()">点击按钮</button>
    <script>
    function myFunction() {
    var v = document.getElementById("demo").value;
    if (v == "" || isNaN(v)) {
    alert(v + "不是数字")
    }
    else {
    alert(v+"是数字")
    }
    }
    </script>
    </div>
    </body>
    </html>

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  • 原文地址:https://www.cnblogs.com/melao2006/p/5135603.html
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