在网页中实现：手势解锁密码

手机的手势解锁，是很好用的功能。方便，而且比输入密码更安全。

小知识：为什么手势密码更安全？
传统密码输入，有按键输入过程，而按下的按键，可能被木马软件记录。且密码输入框中的密码，也可能被非法获取。而手势密码则不存在这些问题。

在网页应用中，是否可以实现一个同样的效果呢？

当然可以，本文就来实现一个。

实现效果：

操作时，用鼠标移动模拟手指触摸。

源码：

创建canvas手势输入框的部分：

将此部分保存为js文件，给后面的代码引用。

注：请看到文章最后，后面还有重点内容。

(function ($) {
var GesturePasswd= function (element, options) {
this.$element = $(element);
this.options = options;
var that=this;
this.pr=options.pointRadii;
this.rr=options.roundRadii;
this.o=options.space;
this.color=options.color;
//全局样式
this.$element.css({
"position":"relation",
"width":this.options.width,
"height":this.options.height,
"background-color":options.backgroundColor,
"overflow":"hidden",
"cursor":"default"
//选择器规范
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);

密码校验部分：

正确的密码是一个字母“Z”的形状哦！
$(function(){
$("#gesturepwd").GesturePasswd({
backgroundColor:"#252736", //背景色
color:"#FFFFFF", //主要的控件颜色
roundRadii:25, //大圆点的半径
pointRadii:6, //大圆点被选中时显示的圆心的半径
space:30, //大圆点之间的间隙
width:240, //整个组件的宽度
height:240, //整个组件的高度
lineColor:"#00aec7", //用户画出线条的颜色
zindex :100 //整个组件的css z-index属性
$("#gesturepwd").on("hasPasswd",function(e,passwd){
var result;
if(passwd == "1235789"){
result=true;
}else{
result=false;
if(result == true){
$("#gesturepwd").trigger("passwdRight");
setTimeout(function(){
//密码验证正确后的其他操作，打开新的页面等。。。
alert("密码正确！")
},500); //延迟半秒以照顾视觉效果
else{
$("#gesturepwd").trigger("passwdWrong");
//密码验证错误后的其他操作。。。

 

代码安全性：

手势密码当然也是要进行校验的，在上述验证的代码中，注意这一部分：

如果在网页查看网页源码，就会被看到JS代码中的密码。

为了防止这种问题的发生，可以用JShaman对这部分代码进行加密：

加密后的代码，将成为：

这样代码中密码泄露的问题也解决了。

完美的网页手势解锁功能完成。