javascript
如何用JavaScript实现获取验证码的效果
轉自：http://www.php.cn/js-tutorial-411734.html
HTML部分：
| 1 2 3 4 5 6 7 | <body onload='createCode()'> ????????<div>驗證碼：? ????????????<input type = "text" id = "input"/>? ????????????<input type="button" id="code" onclick="createCode()" style="width:60px" title='點擊更換驗證碼' /></br> ????????????<input type = "button" value = "驗證" onclick = "validate()"/> ????????</div>? </body> |
CSS部分：
| 1 2 3 4 5 6 7 8 9 | #code{ ????????????font-family:Arial,宋體; ????????????font-style:italic; ????????????color:green; ????????????border:0; ????????????padding:5px 10px; ????????????letter-spacing:3px; ????????????font-weight:bolder; ????????} |
JavaScript部分：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | var code ; //在全局定義驗證碼???????? ????????function createCode(){ ?????????????code = "";?? ?????????????var codeLength = 4;//驗證碼的長度? ?????????????var checkCode = document.getElementById("code");?? ?????????????var random = 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');//隨機數? ?????????????for(var i = 0; i < codeLength; i++) {//循環操作? ????????????????var index = Math.floor(Math.random()*36);//取得隨機數的索引（0~35）? ????????????????code += random[index];//根據索引取得隨機數加到code上? ????????????}? ????????????checkCode.value = code;//把code值賦給驗證碼? ????????} ????????//校驗驗證碼? ????????function validate(){? ????????????var inputCode = document.getElementById("input").value.toUpperCase(); ????????????//取得輸入的驗證碼并轉化為大寫??????? ????????????if(inputCode.length <= 0) { //若輸入的驗證碼長度為0? ????????????????alert("請輸入驗證碼！"); //則彈出請輸入驗證碼? ????????????}else if(inputCode != code ) { //若輸入的驗證碼與產生的驗證碼不一致時? ????????????????alert("驗證碼輸入錯誤!"); //則彈出驗證碼輸入錯誤? ????????????????createCode();//刷新驗證碼? ????????????????document.getElementById("input").value = "";//清空文本框? ????????????}else { //輸入正確時? ????????????????alert("驗證通過"); ????????????} ????????} |
轉載于:https://www.cnblogs.com/sharpest/p/10143899.html
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