簡單的驗證碼代碼

發(fā)布日期：2017年06月21日文章來源：www.ppeeidm.cn

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今天帶給大家一個簡單實用的驗證碼制作方法，喜歡的可以收藏一下！

CSS代碼：

JS代碼：

!(function(window, document) {

function Yzm(options) { //創(chuàng)建一個圖形驗證碼對象，接收options對象為參數

this.options = { //默認options參數值

id: "", //容器Id

canvasId: "verifyCanvas", //canvas的ID

width: "100", //默認canvas寬度

height: "30", //默認canvas高度

type: "blend", //圖形驗證碼默認類型blend:數字字母混合類型、number:純數字、letter:純字母

code: ""

}

if(Object.prototype.toString.call(options) == "[object Object]"){//判斷傳入參數類型

for(var i in options) { //根據傳入的參數，修改默認參數值

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();

}

Yzm.prototype = {

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持canvas";

con.appendChild(canvas);

var parent = this;

canvas.onclick = function(){

parent.refresh();

}

/**生成驗證碼**/

refresh: function() {

var canvas = document.getElementById(this.options.canvasId);

if(canvas.getContext) {

var yzm = canvas.getContext('2d');

}

yzm.textBaseline = "middle";

yzm.fillStyle = randomColor(180, 240);

yzm.fillRect(0, 0, this.options.width, this.options.height);

if(this.options.type == "blend") { //判斷驗證碼類型

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;

yzm.font = randomNum(this.options.height/2, this.options.height) + 'px SimHei';

//隨機生成字體大小

yzm.fillStyle = randomColor(50, 160); //隨機生成字體顏色

yzm.shadowOffsetX = randomNum(-3, 3);

yzm.shadowOffsetY = randomNum(-3, 3);

yzm.shadowBlur = randomNum(-3, 3);

yzm.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);

/**設置旋轉角度和坐標原點**/

yzm.translate(x, y);

yzm.rotate(deg * Math.PI / 180);

yzm.fillText(txt, 0, 0);

/**恢復旋轉角度和坐標原點**/

yzm.rotate(-deg * Math.PI / 180);

yzm.translate(-x, -y);

}

/**繪制干擾線**/

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();

}

/**繪制干擾點**/

for(var i = 0; i < this.options.width/4; i++) {

yzm.fillStyle = randomColor(0, 255);

yzm.beginPath();

yzm.arc(randomNum(0, this.options.width), randomNum(0, this.options.height), 1, 0, 2 * Math.PI);

yzm.fill();

}

/**驗證驗證碼**/

validate: function(code){

var code = code.toLowerCase();

var v_code = this.options.code.toLowerCase();

if(code == v_code){

return true;

}else{

return false;

}

/**生成字母數組**/

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.Yzm = Yzm;

})(window, document);

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簡單的驗證碼代碼