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<pre class="inline:true class:language-html decode:1 " ><!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <!--验证码--> <script language="javascript" type="text/javascript"> var code; function createCode() { //函数体 code = ""; var codeLength = 5; //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);//设置随机产生 code += codeChars[charNum]; } if (checkCode) { checkCode.className = "code"; checkCode.innerHTML = code; } } </script> </head> <style> /*验证码*/ .code { background-color: silver; font-family:Arial; /*设置字体*/ font-style:initial; color:brown; font-size:20px; border:0; padding:2px 3px; letter-spacing:3px; font-weight:bolder; width:81px; height:23px; margin-left: 120px; margin-top: -35px; } a { text-decoration:none; font-size:12px; color:#288bc4; } a:hover { text-decoration:underline; } .yz{ position: absolute; margin-left: 220px; margin-top:-10px; } </style> <body onload="createCode()"><!--在页面加载的同时要加载验证码，否则页面加载完后验证码不会显示 --> <p> <label> 验证码：</label> <div class="code" id="checkCode" onclick="createCode()" ></div><a class="yz" href="#" onclick="createCode()">看不清换一张</a> </p> <p> <label>请输入验证码：</label><input id="YZ" name="yz" width="30px;"> </p> <input class="btttom" type="button" name="OK" id="OK" onclick="GetDom()" value="确认"/> </body> <!--验证--> <script> function GetDom(){ if(document.getElementById("YZ").value==""){ alert("验证码不能为空！"); createCode();//输错一次或提交一次都将会刷新一次验证码 return false; //结束本次会话 }else if(document.getElementById("YZ").value.toUpperCase()!=code.toUpperCase()){ //toUpperCase不区分大小写 alert("您输入的验证码有误，请重新输入！！"); createCode();//读取文件 } else{ alert("ok"); } } </script> </html> |
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