一个用canvas做的js验证码插件
!(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: "",
interfereLine:false,//干扰线
interfereLineNum:'',//干扰线数量//默认为codeNum的值
noiseSpot:false, //干扰噪点
noiseSpotNum:'',//干扰点数量//默认为width/codeNum
codeNum:4,//验证码个数
rotateMinDeg:-10,//旋转的最小角度
rotateMaxDeg:10,//旋转的最大角度
fontMinSize:'',//字体大小最小值 //默认为height值
fontMaxSize:'' //字体大小最大值//默认为height值
}
if(Object.prototype.toString.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();
this.refresh();
}
GVerify.prototype = {
/**版本号**/
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 = "您的浏览器版本不支持canvas";
con.appendChild(canvas);
var parent = this;
canvas.onclick = function(){
parent.refresh();
}
},
/**生成验证码**/
refresh: function() {
this.options.code = "";
var canvas = document.getElementById(this.options.canvasId);
if(canvas.getContext) {
var ctx = canvas.getContext('2d');
}else{
return;
}
ctx.textBaseline = "middle";
ctx.fillStyle = randomColor(180, 240);
ctx.fillRect(0, 0, this.options.width, this.options.height);
if(this.options.type == "blend") { //判断验证码类型
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 = 0; i <= this.options.codeNum-1; i++) {
var txt = txtArr[randomNum(0, txtArr.length)];
this.options.code += txt;
ctx.font = randomNum((this.options.fontMinSize || this.options.height), (this.options.fontMaxSize || 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(-1, 1);
ctx.shadowOffsetY = randomNum(-1, 1);
ctx.shadowBlur = randomNum(-1, 1);
ctx.shadowColor = "rgba(0, 0, 0, 0.3)";
var x = this.options.width / this.options.codeNum * i;
var y = this.options.height / 2;
var deg = randomNum(this.options.rotateMinDeg, this.options.rotateMaxDeg);
/**设置旋转角度和坐标原点**/
ctx.translate(x, y);
ctx.rotate(deg * Math.PI / 180);
ctx.fillText(txt, 0, 0);
/**恢复旋转角度和坐标原点**/
ctx.rotate(-deg * Math.PI / 180);
ctx.translate(-x, -y);
}
/**绘制干扰线**/
if(this.options.interfereLine){
for(var i = 0; i < (this.options.interfereLineNum || this.options.codeNum); 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();
}
}
/**绘制干扰点**/
if(this.options.noiseSpot){
for(var i = 0; i < this.options.noiseSpotNum || (this.options.width/this.options.codeNum); 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 code = code.toLowerCase();
var v_code = this.options.code.toLowerCase();
if(code == v_code){
return true;
}else{
this.refresh();
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;
})(window, document);
下面是验证登录账号和密码的一个使用例子：
$(function(){
//新建一个验证码
var verifyCode = new GVerify({
id:"vdimgck",
type:"blend",
width:'50',
height:'24'
});
$(".no-look-clear-js").on("click",function(){
verifyCode.refresh();//刷新验证码方法
})
$(".login-button-js").on("click",function(){
var self=$(this);
if(self.hasClass("disabled")){
return false;
}
var $errorUser=$(".error-user-js");
var $verifyCode=$(".verify-code-js");
var codeVal=$(".identify-code-js").val().toLowerCase();
if(!verifyCode.validate(codeVal)){//验证验证码方法
$verifyCode.show();
$errorUser.hide();
return false;
}else{
$verifyCode.hide();
}
var userName=$.trim($(".user-name-js").val());
var userPwd=$.trim($(".user-password-js").val());
if(userName!="" && userPwd!=""){
self.addClass("disabled");
$.ajax({
type:"post",
url:"",
data:{userName:userName,userPwd:userPwd},
success:function(res){
if(res){
$errorUser.hide();
$(".login-form-js")[0].submit();
window.location.href="administrator.html";
}else{
$errorUser.show();
}
self.removeClass('disabled');
},
error:function(msg){
console.log(msg);
self.removeClass('disabled');
}
});
}else{
$errorUser.show();
$verifyCode.hide();
$(".user-name-js").focus()
}
})
})
