73 lines
3.0 KiB
JavaScript
73 lines
3.0 KiB
JavaScript
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$(function () {
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var show_num = [];
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draw(show_num);
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$("#canvas").on('click', function () {
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draw(show_num);
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})
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$(".btn").on('click', function () {
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var val = $(".input-val").val().toLowerCase();
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var num = show_num.join("");
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if (val == '') {
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alert('请输入验证码！');
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} else if (val == num) {
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alert('提交成功！');
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$(".input-val").val('');
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// draw(show_num);
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} else {
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alert('验证码错误！请重新输入！');
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$(".input-val").val('');
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// draw(show_num);
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}
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})
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})
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//生成并渲染出验证码图形
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function draw(show_num) {
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var canvas_width = $('#canvas').width();
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var canvas_height = $('#canvas').height();
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var canvas = document.getElementById("canvas"); //获取到canvas的对象，演员
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var context = canvas.getContext("2d"); //获取到canvas画图的环境，演员表演的舞台
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canvas.width = canvas_width;
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canvas.height = canvas_height;
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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";
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var aCode = sCode.split(",");
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var aLength = aCode.length; //获取到数组的长度
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for (var i = 0; i < 4; i++) { //这里的for循环可以控制验证码位数（如果想显示6位数，4改成6即可）
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var j = Math.floor(Math.random() * aLength); //获取到随机的索引值
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// var deg = Math.random() * 30 * Math.PI / 180;//产生0~30之间的随机弧度
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var deg = Math.random() - 0.5; //产生一个随机弧度
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var txt = aCode[j]; //得到随机的一个内容
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show_num[i] = txt.toLowerCase();
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var x = 10 + i * 20; //文字在canvas上的x坐标
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var y = 20 + Math.random() * 8; //文字在canvas上的y坐标
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context.font = "bold 23px 微软雅黑";
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context.translate(x, y);
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context.rotate(deg);
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context.fillStyle = randomColor();
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context.fillText(txt, 0, 0);
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context.rotate(-deg);
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context.translate(-x, -y);
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}
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for (var i = 0; i <= 5; i++) { //验证码上显示线条
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context.strokeStyle = randomColor();
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context.beginPath();
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context.moveTo(Math.random() * canvas_width, Math.random() * canvas_height);
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context.lineTo(Math.random() * canvas_width, Math.random() * canvas_height);
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context.stroke();
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}
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for (var i = 0; i <= 30; i++) { //验证码上显示小点
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context.strokeStyle = randomColor();
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context.beginPath();
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var x = Math.random() * canvas_width;
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var y = Math.random() * canvas_height;
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context.moveTo(x, y);
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context.lineTo(x + 1, y + 1);
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context.stroke();
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}
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}
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//得到随机的颜色值
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function randomColor() {
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var r = Math.floor(Math.random() * 256);
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var g = Math.floor(Math.random() * 256);
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var b = Math.floor(Math.random() * 256);
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return "rgb(" + r + "," + g + "," + b + ")";
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}
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