JavaScript⽣成图形验证码本⽂实例为⼤家分享了js⽣成图形验证码的具体代码，供⼤家参考，具体内容如下getGVerify:function (id)
{
function GVerify(options) { //创建⼀个图形验证码对象，接收options对象为参数
this.options = { //默认options参数值
id: "", //容器Id
canvasId: "verifyCanvas", //canvas的ID
width: "100", //默认canvas宽度
height: "30", //默认canvas⾼度
type: "blend", //图形验证码默认类型blend：数字字母混合类型、number：纯数字、letter：纯字母
code: ""
}
if(String.call(options) == "[object Object]"){//判断传⼊参数类型
for(var i in options) { //根据传⼊的参数，修改默认参数值
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();
}
GVerify.prototype = {
/**版本号**/
version: '1.0.0',
/**初始化⽅法**/
_init: function() {
var con = ElementById(this.options.id);
var canvas = ateElement("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 = "您的浏览器版本不⽀持canvas";
con.appendChild(canvas);
var parent = this;
}
},
/**⽣成验证码**/
refresh: function() {
de = '';
var canvas = ElementById(this.options.canvasId);
Context) {
var ctx = Context('2d');
}
ctx.fillStyle = randomColor(180, 240);
ctx.fillRect(0, 0, this.options.width, this.options.height);
if(pe == "blend") { //判断验证码类型
var txtArr = this.at(this.options.letterArr);
} else if(pe == "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)];
de += txt;
ctx.font = '20px SimHei';
//ctx.font = randomNum(this.options.height/2, this.options.height) + 'px SimHei'; //随机⽣成字体⼤⼩
ctx.fillStyle = randomColor(50, 160); //随机⽣成字体颜⾊
/
* 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);
/**设置旋转⾓度和坐标原点**/
ctx.fillText(txt, 0, 0);
/
**恢复旋转⾓度和坐标原点**/
}
/**绘制⼲扰线**/
for(var i = 0; i < 4; i++) {
ctx.strokeStyle = randomColor(40, 180);
ctx.beginPath();
ctx.lineTo(randomNum(0, this.options.width/2), randomNum(0, this.options.height));
ctx.stroke();
}
/**绘制⼲扰点**/
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();
}
},
/**验证验证码**/
validate: function(code){
var verifyCode = LowerCase();
var v_code = de.toLowerCase();
if(verifyCode == v_code){
return true;
}else{
return false;
}
}
}
/**⽣成字母数组**/
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(",");
}
/**⽣成⼀个随机数**/
function randomNum(min, max) {
return Math.floor(Math.random() * (max - min) + min);
}
/**⽣成⼀个随机⾊**/
function randomColor(min, max) {
var r = randomNum(min, max);
var g = randomNum(min, max);
var b = randomNum(min, max);javascript进度条
return "rgb(" + r + "," + g + "," + b + ")";
}
return new GVerify(id);
}
调⽤⽅法
var verifyCode = new GVerify(id);
验证⽅法
if(verifyCode.validate(inputCode)){
return true;
}esle{
return false;
}
以上就是本⽂的全部内容，希望对⼤家的学习有所帮助，也希望⼤家多多⽀持。

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