js 自動生成的圖形數字驗證碼（前端）

html：

<div id="v_container" style="width: 140px;height: 36px;margin-left: 10px;"></div>

js的具體操做：

$(function () {
    // 定義：存儲驗證碼
     var verifyCode = new GVerify("v_container");
    // 登陸的js驗證
    $("#login").click(function () {
        var res = verifyCode.validate(document.getElementById("yanzheng").value);  //獲取驗證碼

        // 判斷：輸入框裏驗證碼和獲取到的驗證碼是否一致
        if (res) {   //若是同樣就驗證成功

　　　　　　　　console.log(驗證成功的操做；)

        }else if (res.length <1){   //驗證碼輸入的長度=等於0，就提示驗證碼錯誤

　　　　　　　　console.log(驗證碼錯誤的操做；)

　　　　　　　　verifyCode();  //從新刷新驗證碼

            return false;

        } else {   //如不一致，就驗證錯誤

　　　　　　　　console.log(驗證碼錯誤的操做；)

　　　　　　　　verifyCode();  //從新刷新驗證碼

            return false;
        }
    });

});

js自動生成圖形驗證碼：

// 生成圖形驗證碼的JS文件!(function(window, document) {    function GVerify(options) { //建立一個圖形驗證碼對象，接收options對象爲參數        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();    }    GVerify.prototype = {        /**版本號**/        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() {            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;                ctx.font = randomNum(this.options.height/2, this.options.height) + 'px SimHei'; //隨機生成字體大小                ctx.fillStyle = randomColor(50, 160); //隨機生成字體顏色                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);                /**設置旋轉角度和座標原點**/                ctx.translate(x, y);                ctx.rotate(deg * Math.PI / 180);                ctx.fillText(txt, 0, 0);                /**恢復旋轉角度和座標原點**/                ctx.rotate(-deg * Math.PI / 180);                ctx.translate(-x, -y);            }            /**繪製干擾線**/            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();            }            /**繪製干擾點**/            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();            }        },        /**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{                this.refresh();                return false;            }        }    };    /**生成字母數組**/    function getAllLetter() {        var letterStr = "a,b,c,d,e,f,g,h,i,j,k,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,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.GVerify = GVerify;})(window, document);