微信公众号：创享日记
发送：手势密码
获取完整源码（导入微信开发者工具即可用）
以下可以忽略不看！
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 }); }
