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114 lines
3.3 KiB
114 lines
3.3 KiB
2 years ago
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<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>js简单验证码使用</title>
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<style>
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.code
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{
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font-family:Arial;
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font-style:italic;
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color:blue;
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font-size:30px;
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border:0;
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padding:2px 3px;
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letter-spacing:3px;
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font-weight:bolder;
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float:left;
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cursor:pointer;
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width:150px;
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height:50px;
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line-height:60px;
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text-align:center;
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vertical-align:middle;
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background-color:#D8B7E3;
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}
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span {
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text-decoration:none;
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font-size:12px;
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color:#288bc4;
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padding-left:10px;
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}
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span:hover {
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text-decoration:underline;
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cursor:pointer;
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}
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</style>
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</head>
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<script>
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//页面加载时，生成随机验证码
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window.onload=function(){
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createCode(4);
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}
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//生成验证码的方法
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function createCode(length) {
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var code = "";
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var codeLength = parseInt(length); //验证码的长度
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var checkCode = document.getElementById("checkCode");
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////所有候选组成验证码的字符，当然也可以用中文的
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var codeChars = new Array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z');
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//循环组成验证码的字符串
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for (var i = 0; i < codeLength; i++)
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{
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//获取随机验证码下标
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var charNum = Math.floor(Math.random() * 62);
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//组合成指定字符验证码
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code += codeChars[charNum];
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}
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if (checkCode)
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{
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//为验证码区域添加样式名
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checkCode.className = "code";
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//将生成验证码赋值到显示区
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checkCode.innerHTML = code;
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}
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}
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//检查验证码是否正确
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function validateCode()
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{
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//获取显示区生成的验证码
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var checkCode = document.getElementById("checkCode").innerHTML;
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//获取输入的验证码
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var inputCode = document.getElementById("inputCode").value;
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console.log(checkCode);
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console.log(inputCode);
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if (inputCode.length <= 0)
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{
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alert("请输入验证码！");
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}
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else if (inputCode.toUpperCase() != checkCode.toUpperCase())
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{
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alert("验证码输入有误！");
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createCode(4);
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}
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else
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{
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alert("验证码正确！");
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}
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}
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</script>
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<body>
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<div>
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<table border="0" cellspacing="5" cellpadding="5" >
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<tr>
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<td> <div id="checkCode" class="code" onclick="createCode(4)" ></div></td>
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<td> <span onclick="createCode(4)">看不清换一张</span></td>
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</tr>
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<tr>
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<td>验证码：</td>
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<td><input type="text" id="inputCode" style="float:left;" /></td>
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</tr>
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<tr>
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<td></td>
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<td><input type="button" onclick="validateCode()" value="确定" /></td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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