JAvascript canvasによる検証コードの作成
5736 ワード
htmlセクション、divコンテナを作成する
動的認証コードを作成するには、次の手順に従います.
randomCode.js
!(function (window, document) {
var size = 5;//
function GVerify(options) { // , options
this.options = { // options
id: "", // Id
canvasId: "verifyCanvas", //canvas ID
width: "100", // canvas
height: "30", // canvas
type: "blend", // blend: 、number: 、letter:
code: "",
}
if (Object.prototype.toString.call(options) == "[object Object]") {//
for (var i in options) { // ,
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 = {
/** **/
version: '1.0.0',
/** **/
_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 = " canvas";
con.appendChild(canvas);
var parent = this;
canvas.onclick = function () {
parent.refresh();
}
},
/** **/
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") { //
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 <= size; i++) {
var txt = txtArr[randomNum(0, txtArr.length)];
this.options.code += txt;
ctx.font = randomNum(this.options.height / 2, this.options.height) + 'px SimHei'; //
ctx.fillStyle = randomColor(50, 160); //
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 / (size + 1) * i;
var y = this.options.height / 2;
var deg = randomNum(-30, 30);
/** **/
ctx.translate(x, y);
ctx.rotate(deg * Math.PI / 180);
ctx.fillText(txt, 0, 0);
/** **/
ctx.rotate(-deg * Math.PI / 180);
ctx.translate(-x, -y);
}
/** **/
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();
}
/** **/
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();
}
},
/** **/
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;
}
}
}
/** **/
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(",");
}
/** **/
function randomNum(min, max) {
return Math.floor(Math.random() * (max - min) + min);
}
/** **/
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);
動的認証コードを作成するには、次の手順に従います.
window.οnlοad=function () {
var validate = new GVerify("login_validate");
}