圖形驗證碼
阿新 • • 發佈：2018-11-08
繪製圖形驗證碼和校驗圖形驗證碼都在前段實現
html
1.layui實現圖形驗證碼
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <link rel="stylesheet" href="../../layui/css/layui.css" /> </head> <body> <fieldset class="layui-elem-field layui-field-title" style="margin-top: 20px;"> <legend>圖形驗證碼</legend> </fieldset> <form class="layui-form" action=""> <div class="layui-form-item"> <label class="layui-form-label">圖形驗證碼</label> <div class="layui-input-inline"> <input type="text" name="imgVercode" id="imgVercode" autocomplete="off" placeholder="請輸入圖形驗證碼" class="layui-input"> </div> <div class="layui-input-inline"> <div id="get-vercode" style="width: 120px;height: 39px;"></div> </div> </div> <div class="layui-form-item"> <div class="layui-input-block"> <button class="layui-btn" lay-submit="" id="sub-img-code">立即提交</button> </div> </div> </form> <script type="text/javascript" src="../../layui/layui.js" ></script> <script type="text/javascript" src="../../js/user/imgcodeVerify.js" ></script> <script> var verifyCode = new GVerify("get-vercode"); layui.use(['form','jquery'],function(){ var form = layui.form, $ = layui.$; $('#sub-img-code').click(function(){ var res = verifyCode.validate($('#imgVercode').val()); if(res){ alert("驗證正確"); }else{ alert("驗證碼錯誤"); } }); }); </script> </body> </html>
初始介面：
直接點選提交：
輸入驗證碼提交：
2.一般圖形驗證
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>圖形驗證碼</title> </head> <body> <div id="v_container" style="width: 200px;height: 50px;"></div> <input type="text" id="code_input" value="" placeholder="請輸入驗證碼"/> <button id="my_button">驗證</button> </body> <script src="js/gVerify.js"></script> <script> var verifyCode = new GVerify("v_container"); document.getElementById("my_button").onclick = function(){ var res = verifyCode.validate(document.getElementById("code_input").value); if(res){ alert("驗證正確"); }else{ alert("驗證碼錯誤"); } } </script> </html>
js
!(function(window, document) { function GVerify(options) { //建立一個圖形驗證碼物件，接收options物件為引數 this.options = { //預設options引數值 id: "", //容器Id canvasId: "verifyCanvas", //canvas的ID width: "100", //預設canvas寬度 height: "30", //預設canvas高度 type: "blend", //圖形驗證碼預設型別blend:數字字母混合型別、number:純數字、letter:純字母 code: "" } if(Object.prototype.toString.call(options) == "[object Object]"){//判斷傳入引數型別 for(var i in options) { //根據傳入的引數，修改預設引數值 this.options[i] = options[i]; } }else{ this.options.id = options; } this.options.numArr = "0,1,2,3,4,5,6,7,8,9".split(","); this.options.letterArr = getAllLetter(); this._init(); this.refresh(); } GVerify.prototype = { /**版本號**/ version: '1.0.0', /**初始化方法**/ _init: function() { var con = document.getElementById(this.options.id); var canvas = document.createElement("canvas"); this.options.width = con.offsetWidth > 0 ? con.offsetWidth : "100"; this.options.height = con.offsetHeight > 0 ? con.offsetHeight : "30"; canvas.id = this.options.canvasId; canvas.width = this.options.width; canvas.height = this.options.height; canvas.style.cursor = "pointer"; canvas.innerHTML = "您的瀏覽器版本不支援canvas"; con.appendChild(canvas); var parent = this; canvas.onclick = function(){ parent.refresh(); } }, /**生成驗證碼**/ refresh: function() { this.options.code = ""; var canvas = document.getElementById(this.options.canvasId); if(canvas.getContext) { var ctx = canvas.getContext('2d'); }else{ return; } ctx.textBaseline = "middle"; ctx.fillStyle = randomColor(180, 240); ctx.fillRect(0, 0, this.options.width, this.options.height); if(this.options.type == "blend") { //判斷驗證碼型別 var txtArr = this.options.numArr.concat(this.options.letterArr); } else if(this.options.type == "number") { var txtArr = this.options.numArr; } else { var txtArr = this.options.letterArr; } for(var i = 1; i <= 4; i++) { var txt = txtArr[randomNum(0, txtArr.length)]; this.options.code += txt; ctx.font = randomNum(this.options.height/2, this.options.height) + 'px SimHei'; //隨機生成字型大小 ctx.fillStyle = randomColor(50, 160); //隨機生成字型顏色 ctx.shadowOffsetX = randomNum(-3, 3); ctx.shadowOffsetY = randomNum(-3, 3); ctx.shadowBlur = randomNum(-3, 3); ctx.shadowColor = "rgba(0, 0, 0, 0.3)"; var x = this.options.width / 5 * i; var y = this.options.height / 2; var deg = randomNum(-30, 30); /**設定旋轉角度和座標原點**/ ctx.translate(x, y); ctx.rotate(deg * Math.PI / 180); ctx.fillText(txt, 0, 0); /**恢復旋轉角度和座標原點**/ ctx.rotate(-deg * Math.PI / 180); ctx.translate(-x, -y); } /**繪製干擾線**/ for(var i = 0; i < 4; i++) { ctx.strokeStyle = randomColor(40, 180); ctx.beginPath(); ctx.moveTo(randomNum(0, this.options.width), randomNum(0, this.options.height)); ctx.lineTo(randomNum(0, this.options.width), randomNum(0, this.options.height)); ctx.stroke(); } /**繪製干擾點**/ for(var i = 0; i < this.options.width/4; i++) { ctx.fillStyle = randomColor(0, 255); ctx.beginPath(); ctx.arc(randomNum(0, this.options.width), randomNum(0, this.options.height), 1, 0, 2 * Math.PI); ctx.fill(); } }, /**驗證驗證碼**/ validate: function(code){ var code = code.toLowerCase(); var v_code = this.options.code.toLowerCase(); console.log(v_code); if(code == v_code){ return true; }else{ this.refresh(); return false; } } } /**生成字母陣列**/ function getAllLetter() { var letterStr = "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"; return letterStr.split(","); } /**生成一個隨機數**/ function randomNum(min, max) { return Math.floor(Math.random() * (max - min) + min); } /**生成一個隨機色**/ function randomColor(min, max) { var r = randomNum(min, max); var g = randomNum(min, max); var b = randomNum(min, max); return "rgb(" + r + "," + g + "," + b + ")"; } window.GVerify = GVerify; })(window, document);