微信公众号：创享日记
发送：手势密码
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手势密码就是在手机触屏上设置一笔连成的九宫格图案，登录时画一下设定的图形。
运行程序，发现各个数字的个数，其中
4位的有1624个，5位的有7152个，6位的有26016个，7位的有72912个，8位的有140704个，9位的有140704个，总共有389112种！
值得一提的是，6位以下的个数甚至每到10000种，所以设置密码最好设置6位以上的，当然不怕忘记的话，可以设置9位的变态密码。
目前app内常用的安全验证，有密码、手势、指纹、面部识别。你会发现从便利性&安全性从高到低的划分是，面部识别、指纹识别、手势、密码。随着时代和技术的进步，安全验证更加趋向于个人生物化。n年前，如果密码被a知道了，a完全可以通过密码/手势来获得和你同样的权利进行相关操作。现在，则可通过生物认证。指纹和面部识别来确定是否是本人进行操作，大大提升了产品的安全性。
使用手势密码登录时，如果输入错误，会对用户进行错误提示，提示后用户可以继续输入，当同一个账号输错达5次时，系统会自动退出登录，用户需要输入密码验证身份成功后才能进入app。
在手势登录页面，也可以使用忘记手势密码登录，如果点击忘记手势密码，退出登录，输入密码验证身份成功后，页面跳转至手势密码设置页面，设置新的手势密码。设置完成后，会自动登录app。
function(){
var wxlocker = function(obj){
this.chooseType = 3; // 3*3的圆点格子
};
wxlocker.prototype.drawCle = function(x, y) { // 初始化解锁密码面板
this.ctx.setStrokeStyle('#10AEFF');
this.ctx.setLineWidth(1);
this.ctx.beginPath();
this.ctx.arc(x, y, this.r, 0, Math.PI * 2, true);
this.ctx.closePath();
this.ctx.stroke();
}
wxlocker.prototype.drawLine = function(po, lastPoint) {// 解锁轨迹
this.ctx.beginPath();
this.ctx.setLineWidth(1);
this.ctx.moveTo(this.lastPoint[0].x, this.lastPoint[0].y);
for (var i = 1 ; i < this.lastPoint.length ; i++) {
this.ctx.lineTo(this.lastPoint[i].x, this.lastPoint[i].y);
}
this.ctx.lineTo(po.x, po.y);
this.ctx.stroke();
this.ctx.closePath();
}
wxlocker.prototype.createCircle = function() {// 创建解锁点的坐标，根据canvas的大小来平均分配半径
var cavW = this.setCanvasSize().w;
var cavH = this.setCanvasSize().h;
var n = this.chooseType;
var count = 0;
this.r = cavW / (2 + 4 * n);// 公式计算
this.lastPoint = [];
this.arr = [];
this.restPoint = [];
var r = this.r;
for (var i = 0 ; i < n ; i++) {
for (var j = 0 ; j < n ; j++) {
count++;
var obj = {
x: j * 4 * r + 3 * r,
y: i * 4 * r + 3 * r,
index: count
};
this.arr.push(obj);
this.restPoint.push(obj);
}
}
// this.ctx.clearRect(0, 0, cavW, cavH);
for (var i = 0 ; i < this.arr.length ; i++) {
this.drawCle(this.arr[i].x, this.arr[i].y);
}
wx.drawCanvas({
canvasId: "locker",
actions: this.ctx.getActions(),
reserve:false
});
//return arr;
}
wxlocker.prototype.getPosition = function(e) {// 获取touch点相对于canvas的坐标
// var rect = e.target;
var po = {
x: e.touches[0].x,
y: e.touches[0].y
};
return po;
}
wxlocker.prototype.update = function(po) {// 核心变换方法在touchmove时候调用
var cavW = this.setCanvasSize().w;
var cavH = this.setCanvasSize().h;
this.ctx.clearRect(0, 0, cavW, cavH);
for (var i = 0 ; i < this.arr.length ; i++) { // 每帧先把面板画出来
this.drawCle(this.arr[i].x, this.arr[i].y);
}
this.drawPoint();// 每帧画圆心
this.drawLine(po , this.lastPoint);// 每帧画轨迹
for (var i = 0 ; i < this.restPoint.length ; i++) {
if (Math.abs(po.x - this.restPoint[i].x) < this.r && Math.abs(po.y - this.restPoint[i].y) < this.r) {
this.drawPoint();
this.lastPoint.push(this.restPoint[i]);
this.restPoint.splice(i, 1);
break;
}
}
}
wxlocker.prototype.checkPass = function(psw1, psw2) {// 检测密码
var p1 = '',
p2 = '';
for (var i = 0 ; i < psw1.length ; i++) {
p1 += psw1[i].index + psw1[i].index;
}
for (var i = 0 ; i < psw2.length ; i++) {
p2 += psw2[i].index + psw2[i].index;
}
return p1 === p2;
}
wxlocker.prototype.storePass = function(psw,cb) {// touchend结束之后对密码和状态的处理
if (this.pswObj.step == 1) {//step==1表示还没有设置密码状态
if (this.checkPass(this.pswObj.fpassword, psw)) {
this.pswObj.step = 2;
this.pswObj.spassword = psw;
this.resetHidden = false;
this.title = "密码保存成功";
this.titleColor = "succ";
this.drawStatusPoint('#09bb07');
wx.setStorageSync('passwordxx', JSON.stringify(this.pswObj.spassword));
// wx.setStorageSync('chooseType', this.chooseType);
} else {
this.title = "两次绘制不一致，重新绘制";
this.titleColor = "error";
this.drawStatusPoint('#e64340');
delete this.pswObj.step;
}
} else if (this.pswObj.step == 2) {
if (this.checkPass(this.pswObj.spassword, psw)) {
this.title = "解锁成功";
this.titleColor = "succ";
this.drawStatusPoint('#09bb07');
cb();
} else {
this.title = "解锁失败";
this.titleColor = "error";
this.drawStatusPoint('#e64340');
}
} else {
if(this.lastPoint.length<4){
this.title="密码过于简单，请至少连接4个点";
this.resetHidden = true;
this.titleColor = "error";
return false;
}else{
this.pswObj.step = 1;
this.pswObj.fpassword = psw;
this.titleColor = "";
this.title = "再次输入";
}
}
}
wxlocker.prototype.makeState = function() {
if (this.pswObj.step == 2) {
this.resetHidden = false;
this.title = "请解锁";
this.titleColor = "";
} else if (this.pswObj.step == 1) {
this.title="请设置手势密码";
this.resetHidden = true;
this.titleColor = "";
} else {
this.title="请设置手势密码";
this.resetHidden = true;
this.titleColor = "";
}
}
wxlocker.prototype.updatePassword = function(){//点击重置按钮，重置密码
wx.removeStorageSync("passwordxx");
// wx.removeStorageSync("chooseType");
this.pswObj = {};
this.title="请设置手势密码";
this.resetHidden = true;
this.titleColor = "";
this.reset();
}
wxlocker.prototype.init = function() {//初始化锁盘
this.pswObj = wx.getStorageSync('passwordxx') ? {
step: 2,
spassword: JSON.parse(wx.getStorageSync('passwordxx'))
} : {};
this.lastPoint = [];//记录手指经过的圆圈
this.makeState();
this.touchFlag = false;
this.ctx = wx.createContext();//创建画布
this.createCircle();//画圆圈
}
wxlocker.prototype.reset = function() {
this.createCircle();
}
//适配不同屏幕大小的canvas
wxlocker.prototype.setCanvasSize = function(){
var size={};
try {
var res = wx.getSystemInfoSync();
var scale = 750/686;//不同屏幕下canvas的适配比例；设计稿是750宽
var width = res.windowWidth/scale;
var height = width;//canvas画布为正方形
size.w = width;
size.h = height;
} catch (e) {
// Do something when catch error
console.log("获取设备信息失败"+e);
}
return size;
}
wxlocker.prototype.bindtouchstart = function(e){
if(e.touches.length==1){
var self = this;
var po = self.getPosition(e);
for (var i = 0 ; i < self.arr.length ; i++) {
//判断手指触摸点是否在圆圈内
if (Math.abs(po.x - self.arr[i].x) < self.r && Math.abs(po.y - self.arr[i].y) < self.r) {
self.touchFlag = true;
self.drawPoint();
self.lastPoint.push(self.arr[i]);
self.restPoint.splice(i,1);
break;
}
}
}
wx.drawCanvas({
canvasId: "locker",
actions: this.ctx.getActions(),
reserve:true
});
}
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