JavaScript+html實現前端頁面隨機二維碼驗證
阿新 • • 發佈：2021-06-08
分享炫酷的前端頁面隨機二維碼驗證，供大家參考，具體內容如下
直接上程式碼
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> <!--引入jquery的js --> <script type="text/javascript" src="../jquery/jquery.js"></script> </head> <style> .input-val { width: 200px; height: 32px; border: 1px solid #ddd; box-sizing: border-box; } #canvas { vertical-align: middle; box-sizing: border-box; border: 1px solid #ddd; cursor: pointer; } .btn { display: block; margin-top: 20px; height: 32px; width: 100px; font-size: 16px; color: #fff; background-color: #457adb; border: none; border-radius: 50px; } </style> <body> <div class="code"> <input type="text" value="" placeholder="請輸入驗證碼（不區分大小寫）" class="input-val"> <canvas id="canvas" width="100" height="30"></canvas> <button class="btn">提交</button> </div> </body> <script> $(function(){ var show_num = []; draw(show_num); $("#canvas").on('click',function(){ draw(show_num); }) $(".btn").on('click',function(){ var val = $(".input-val").val().toLowerCase(); var num = show_num.join(""); if(val==''){ al程式設計客棧ert('請輸入驗證碼！'); }else if(val == num){ alert('提交成功！'); $(".input-val").val(''); // draw(show_num); }else{ alert('驗證碼錯誤！請重新輸入！'); $(".input-val").val(''); // draw(show_num); } }) }) //生成並渲染出驗證碼圖形 function draw(show_num) { var canvas_width=$('#canvas').width(); var canvas_height=www.cppcns.com$('#canvas').height(); var canvas = document.getElementById("canvas"www.cppcns.com);//獲取到canvas的物件，演員 var context = canvas.getContext("2d");//獲取到canvas畫圖的環境，演員表演的舞臺 canvas.width = canvas_width; canvas.height = canvas_height; var sCode = "a,b,c,d,e,f,g,h,i,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,W,X,Y,Z,1,2,3,4,5,6,7,8,9,0"; var aCode程式設計客棧= sCode.split(","); var aLength = aCode.length;//獲取到陣列的長度 for (var i = 0; i < 4; i++) { //這裡的for迴圈可以控制驗證碼位數（如果想顯示6位數，4改成6即可） var j = Math.floor(Math.random() * aLength);//獲取到隨機的索引值 // var deg = Math.random() * 30 * Math.PI / 180;//產生0~30之間的隨機弧度 var deg = Math.random() - 0.5; //產生一個隨機弧度 var txt = aCode[j];//得到隨機的一個內容 show_num[i] = txt.toLowerCase(); var x = 10程式設計客棧 + i * 20;//文字在canvas上的x座標 var y = 20 + Math.random() * 8;//文字在canvas上的y座標 context.font = "bold 23px 微軟雅黑"; context.translate(x,y); context.rotate(deg); context.fillStyle = randomColor(); context.fillText(txt,0); context.rotate(-deg); context.translate(-x,-y); } for (var i = 0; i <= 5; i++) { //驗證碼上顯示線條 context.strokeStyle = randomColor(); context.beginPath(); context.moveTo(Math.random() * canvas_width,Math.random() * canvas_height); context.lineTo(Math.random() * canvas_width,Math.random() * canvas_height); context.stroke(); } for (var i = 0; i <= 30; i++) { //驗證碼上顯示小點 context.strokeStyle = randomColor(); context.beginPath(); var x = Math.random() * canvas_width; var y = Math.random() * canvas_height; context.moveTo(x,y); context.lineTo(x + 1,y + 1); context.stroke(); } } //得到隨機的顏色值 function randomColor() { var r = Math.floor(Math.random() * 256); var g = Math.floor(Math.random() * 256); var b = Math.floor(Math.random() * 256); return "rgb(" + r + "," + g + "," + b + ")"; } </script> </html>
效果如下
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。