手機的手勢解鎖，是很好用的功能。方便，而且比輸入密碼更安全。
小知識：為什么手勢密碼更安全？
傳統密碼輸入，有按鍵輸入過程，而按下的按鍵，可能被木馬軟件記錄。且密碼輸入框中的密碼，也可能被非法獲取。而手勢密碼則不存在這些問題。
在網頁應用中，是否可以實現一個同樣的效果呢？
當然可以，本文就來實現一個。
實現效果：
操作時，用鼠標移動模擬手指觸摸。
源碼：
創建canvas手勢輸入框的部分：
將此部分保存為js文件，給后面的代碼引用。
注：請看到文章最后，后面還有重點內容。
(function ($) {
var GesturePasswd= function (element, options) {
this.$element = $(element);
this.options = options;
var that=this;
this.pr=options.pointRadii;
this.rr=options.roundRadii;
this.o=options.space;
this.color=options.color;
//全局樣式
this.$element.css({
"position":"relation",
"width":this.options.width,
"height":this.options.height,
"background-color":options.backgroundColor,
"overflow":"hidden",
"cursor":"default"
//選擇器規范
if(! $(element).attr("id"))
$(element).attr("id",(Math.random()*65535).toString());
this.id="#"+$(element).attr("id");
var Point = function (x,y){
this.x =x;this.y=y
this.result="";
this.pList=[];
this.sList=[];
this.tP=new Point(0,0);
this.$element.Append('');
this.$c= $(this.id+" .main-c")[0];
this.$ctx=this.$c.getContext('2d');
this.initDraw=function(){
this.$ctx.strokeStyle=this.color;
this.$ctx.lineWidth=2;
for(var j=0; j<3;j++ ){
for(var i =0;i<3;i++){
this.$ctx.moveTo(this.o/2+this.rr*2+i*(this.o+2*this.rr),this.o/2+this.rr+j*(this.o+2*this.rr));
this.$ctx.arc(this.o/2+this.rr+i*(this.o+2*this.rr),this.o/2+this.rr+j*(this.o+2*this.rr),this.rr,0,2*Math.PI);
var tem=new Point(this.o/2+this.rr+i*(this.o+2*this.rr),this.o/2+this.rr+j*(this.o+2*this.rr));
if (that.pList.length < 9)
this.pList.push(tem);
this.$ctx.stroke();
this.initImg=this.$ctx.getImageData(0,0,this.options.width,this.options.height);
this.initDraw();
this.isIn=function(x,y){
for (var p in that.pList){
if(( Math.pow((x-that.pList[p]["x"]),2)+Math.pow((y-that.pList[p]["y"]),2) ) < Math.pow(this.rr,2)){
return that.pList[p];
return 0;
this.pointDraw =function(c){
if (arguments.length>0){
that.$ctx.strokeStyle=c;
that.$ctx.fillStyle=c;
for (var p in that.sList){
that.$ctx.moveTo(that.sList[p]["x"]+that.pr,that.sList[p]["y"]);
that.$ctx.arc(that.sList[p]["x"],that.sList[p]["y"],that.pr,0,2*Math.PI);
that.$ctx.fill();
this.lineDraw=function (c){
if (arguments.length>0){
that.$ctx.strokeStyle=c;
that.$ctx.fillStyle=c;
if(that.sList.length > 0){
for( var p in that.sList){
if(p == 0){
console.log(that.sList[p]["x"],that.sList[p]["y"]);
that.$ctx.moveTo(that.sList[p]["x"],that.sList[p]["y"]);
continue;
that.$ctx.l.NETo(that.sList[p]["x"],that.sList[p]["y"]);
console.log(that.sList[p]["x"],that.sList[p]["y"]);
this.allDraw =function(c){
if (arguments.length>0){
this.pointDraw(c);
this.lineDraw(c);
that.$ctx.stroke();
else {
this.pointDraw();
this.lineDraw();
this.draw=function(x,y){
that.$ctx.clearRect(0,0,that.options.width,that.options.height);
that.$ctx.beginPath();
that.$ctx.putImageData(this.initImg,0,0);
that.$ctx.lineWidth=4;
that.pointDraw(that.options.lineColor);
that.lineDraw(that.options.lineColor);
that.$ctx.lineTo(x,y);
that.$ctx.stroke();
this.pointInList=function(poi,list){
for (var p in list){
if( poi["x"] == list[p]["x"] && poi["y"] == list[p]["y"]){
return ++p;
return false;
this.touched=false;
$(this.id).on ("mousedown touchstart",{that:that},function(e){
e.data.that.touched=true;
$(this.id).on ("mouseup touchend",{that:that},function(e){
e.data.that.touched=false;
that.$ctx.clearRect(0,0,that.options.width,that.options.height);
that.$ctx.beginPath();
that.$ctx.putImageData(e.data.that.initImg,0,0);
that.allDraw(that.options.lineColor);
for(var p in that.sList){
if(e.data.that.pointInList(that.sList[p], e.data.that.pList)){
e.data.that.result= e.data.that.result+(e.data.that.pointInList(that.sList[p], e.data.that.pList)).toString();
$(element).trigger("hasPasswd",that.result);
$(this.id).on('touchmove mousemove',{that:that}, function(e) {
if(e.data.that.touched){
var x= e.pageX || e.originalEvent.targetTouches[0].pageX ;
var y = e.pageY || e.originalEvent.targetTouches[0].pageY;
x=x-that.$element.offset().left;
y=y-that.$element.offset().top;
var p = e.data.that.isIn(x, y);
console.log(x)
if(p != 0 ){
if ( !e.data.that.pointInList(p,e.data.that.sList)){
e.data.that.sList.push(p);
console.log( e.data.that.sList);
e.data.that.draw(x, y);
$(this.id).on('passwdWrong',{that:that}, function(e) {
that.$ctx.clearRect(0,0,that.options.width,that.options.height);
that.$ctx.beginPath();
that.$ctx.putImageData(that.initImg,0,0);
that.allDraw("#cc1c21");
that.result="";
that.pList=[];
that.sList=[];
setTimeout(function(){
that.$ctx.clearRect(0,0,that.options.width,that.options.height);
that.$ctx.beginPath();
that.initDraw()
},500)
$(this.id).on('passwdRight',{that:that}, function(e) {
that.$ctx.clearRect(0,0,that.options.width,that.options.height);
that.$ctx.beginPath();
that.$ctx.putImageData(that.initImg,0,0);
that.allDraw("#00a254");
that.result="";
that.pList=[];
that.sList=[];
setTimeout(function(){
that.$ctx.clearRect(0,0,that.options.width,that.options.height);
that.$ctx.beginPath();
that.initDraw()
},500)
GesturePasswd.DEFAULTS = {
zindex :100,
roundRadii:25,
pointRadii:6,
space:30,
width:240,
height:240,
lineColor:"#00aec7",
backgroundColor:"#252736",
color:"#FFFFFF"
function Plugin(option,arg) {
return this.each(function () {
var $this = $(this);
var options = $.extend({}, GesturePasswd.DEFAULTS, typeof option == 'object' && option);
var data = $this.data('GesturePasswd');
var action = typeof option == 'string' ? option : NaN;
if (!data) $this.data('danmu', (data = new GesturePasswd(this, options)));
if (action) data[action](arg);
$.fn.GesturePasswd = Plugin;
$.fn.GesturePasswd.Constructor = GesturePasswd;
})(jQuery);
密碼校驗部分：
正確的密碼是一個字母“Z”的形狀哦！
$(function(){
$("#gesturepwd").GesturePasswd({
backgroundColor:"#252736", //背景色
color:"#FFFFFF", //主要的控件顏色
roundRadii:25, //大圓點的半徑
pointRadii:6, //大圓點被選中時顯示的圓心的半徑
space:30, //大圓點之間的間隙
width:240, //整個組件的寬度
height:240, //整個組件的高度
lineColor:"#00aec7", //用戶畫出線條的顏色
zindex :100 //整個組件的css z-index屬性
$("#gesturepwd").on("hasPasswd",function(e,passwd){
var result;
if(passwd == "1235789"){
result=true;
}else{
result=false;
if(result == true){
$("#gesturepwd").trigger("passwdRight");
setTimeout(function(){
//密碼驗證正確后的其他操作，打開新的頁面等。。。
alert("密碼正確！")
},500); //延遲半秒以照顧視覺效果
else{
$("#gesturepwd").trigger("passwdWrong");
//密碼驗證錯誤后的其他操作。。。
代碼安全性：
手勢密碼當然也是要進行校驗的，在上述驗證的代碼中，注意這一部分：
如果在網頁查看網頁源碼，就會被看到JS代碼中的密碼。
為了防止這種問題的發生，可以用JShaman對這部分代碼進行加密：
加密后的代碼，將成為：
這樣代碼中密碼泄露的問題也解決了。
完美的網頁手勢解鎖功能完成。
