效果如下： 复制代码 代码如下: <BR> .code<BR> {<BR> background:url(code_bg.jpg);<BR> font-family:Arial;<BR> font-style:italic;<BR> color:blue;<BR> font-size:30px;<BR> border:0;<BR> padding:2px 3px;<BR> letter-spacing:3px;<BR> font-weight:bolder; <BR> float:left; <BR> cursor:pointer;<BR> width:150px;<BR> height:60px;<BR> line-height:60px;<BR> text-align:center;<BR> vertical-align:middle;<br><br> }<BR> a<BR> {<BR> text-decoration:none;<BR> font-size:12px;<BR> color:#288bc4;<BR> }<BR> a:hover<BR> {<BR> text-decoration:underline;<BR> }<BR> <br><br> var code;<BR> function createCode() {<BR> code = "";<BR> var codeLength = 6; //验证码的长度<BR> var checkCode = document.getElementById("checkCode");<BR> var codeChars = new Array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, <BR> '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',<BR> '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'); //所有候选组成验证码的字符，当然也可以用中文的<BR> for (var i = 0; i < codeLength; i++) <BR> {<BR> var charNum = Math.floor(Math.random() * 52);<BR> code += codeChars[charNum];<BR> }<BR> if (checkCode) <BR> {<BR> checkCode.className = "code";<BR> checkCode.innerHTML = code;<BR> }<BR> }<BR> function validateCode() <BR> {<BR> var inputCode = document.getElementById("inputCode").value;<BR> if (inputCode.length <= 0) <BR> {<BR> alert("请输入验证码！");<BR> }<BR> else if (inputCode.toUpperCase() != code.toUpperCase()) <BR> {<BR> alert("验证码输入有误！");<BR> createCode();<BR> }<BR> else <BR> {<BR> alert("验证码正确！");<BR> } <BR> } <BR> 看不清换一张 验证码： 请输入验证码
