<script language="javascript" type="text/javascript">var code;function createCode() {code = "";var codeLength = 4; //验证码的长度var checkCode = document.getElementById("checkCode");var codeChars = new Array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9,'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','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for (var i = 0; i < codeLength; i++){var charNum = Math.floor(Math.random() * 52);code += codeChars[charNum];}if (checkCode){checkCode.className = "code";checkCode.innerHTML = code;}}function validateCode(){var inputCode = document.getElementById("inputCode").value;if (inputCode.length <= 0){alert("请输入验证码！");}else if (inputCode.toUpperCase() != code.toUpperCase()){alert("false！");createCode();}else{alert("ture！");}}</script></head><body onLoad="createCode()"><form id="form1" runat="server" onSubmit="validateCode()"><div><table border="0" cellspacing="5" cellpadding="5" ><tr><td></td><td> <div class="code" id="checkCode" onClick="createCode()" ></div></td></tr><tr><td>验证码：</td><td><input style="float:left;" type="text" id="inputCode" /></td><td>请输入验证码</td></tr><tr><td></td><td><input id="Button1" onclick="validateCode();" type="button" value="确定" /></td><td></td></tr></table></div></form></body>
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