html中图⽚验证码怎么写,js实现图⽚验证码
js代码
!(function(window, document) {
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{//传⼊单个对象就是id
this.options.id = options;
}
this.options.numArr = "0,1,2,3,4,5,6,7,8,9".split(",");//数字
this.options.letterArr = getAllLetter();//⽣成字母数组
this._init();//初始化
}
GVerify.prototype = {
/**版本号**/
version: '1.0.0',
/**初始化⽅法**/
_init: function() {
var con = ElementById(this.options.id);//获得验证码的DIV
var canvas = ElementById(this.options.canvasId);//获得画布 IE不能⽀持canvas，可以增加excanvas.js插件，但是还是不⽀持createelement()的形式
this.options.width = con.offsetWidth > 0 ? con.offsetWidth : "100";//如果有宽度就使⽤⾃⼰的，没有就默认100
this.options.height = con.offsetHeight > 0 ? con.offsetHeight : "30";//如果有长度就使⽤⾃⼰的，没有就默认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);
// canvas.id = this.options.canvasId;//为兼容IE把这些去掉，还需要在HTML中写⼊canvas标签
// 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;//把this赋值parent
}
},
/**⽣成验证码**/
refresh: function() {
de = "";//定义验证码为""
var canvas = ElementById(this.options.canvasId);//获得验证码画布
Context) {//
var ctx = Context('2d');//获得绘画对象
}else{//
return;
}
html document是什么ctx.fillStyle = randomColor(180, 240);
ctx.fillRect(0, 0, this.options.width, this.options.height);//绘制矩形
/* x：矩形起点横坐标(坐标原点为canvas的左上⾓，当然确切的来说是原始原点，后⾯写到变形的时候你就懂了，现在暂时不⽤关系) y：矩形起点纵坐标
width：矩形长度
height：矩形⾼度*/
if(pe == "blend") { //判断验证码类型 blend：数字字母混合类型、number：纯数字、letter：纯字母
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)];//取得⼀个字符
de += txt;//连接验证码
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); //填充的样式 随机⽣成字体颜⾊
ctx.shadowOffsetX = randomNum(-3, 3);//阴影的横向位移量
ctx.shadowOffsetY = randomNum(-3, 3);//阴影的纵向位移量
ctx.shadowBlur = randomNum(-3, 3);//阴影的模糊范围(值越⼤越模糊)
ctx.shadowColor = "rgba(0, 0, 0, 0.3)";//阴影的颜⾊
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
*
* 平移anslate(x,y)
* x：坐标原点向x轴⽅向平移x
* y：坐标原点向y轴⽅向平移y
*
* **/
ctx.fillText(txt, 0, 0);//context.fillText(text,x,y)
/**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);//随机颜⾊
ctx.beginPath();//路径 context.beginPath()
ctx.lineTo(randomNum(0, this.options.width), 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);// 圆弧context.arc(x, y, radius, starAngle,endAngle, anticlockwise)
ctx.fill();
}
},
/**验证验证码**/
validate: function(code){
var code = LowerCase();
var v_code = de.toLowerCase();
//console.log(v_code);
if(code == 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);
return "rgb(" + r + "," + g + "," + b + ")";
}
window.GVerify = GVerify;//设置为window对象
})(window, document);
HTML代码
图形验证码
验证
var verifyCode = new GVerify("v_container");
var res = verifyCode.ElementById("code_input").value); if(res){
alert("验证正确");
}else{
alert("验证码错误");
}
}

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