本文实例为大家分享了微信小程序实现电子签名的具体代码，供大家参考，具体内容如下

// XXXX.wxml<view class="signName"> <canvas class="canvas" id="canvas" canvas-id="canvas" disable-scroll="true" bindtouchstart="canvasStart" bindtouchmove="canvasMove" bindtouchend="canvasEnd" touchcancel="canvasEnd" binderror="canvasIdErrorCallback"></canvas> </view> <view class="CList flex"> <view class="flex_item marginR20" > <view class="saveBtn" bindtap="uploadImg">上传签名</view> </view> <view class="flex_item"> <view class="clearBtn" bindtap="cleardraw">清除签名</view></view>

js:

var context = null;// 使用 wx.createContext 获取绘图上下文 contextvar isButtonDown = false;//是否在绘制中var arrx = [];//动作横坐标var arry = [];//动作纵坐标var arrz = [];//总做状态，标识按下到抬起的一个组合var canvasw = 0;//画布宽度var canvash = 0;//画布高度Page({ data: { }, onLoad: function () { this.startCanvas(); }, /** * 以下 - 手写签名 / 上传签名 */ startCanvas: function () {//画布初始化执行 var that = this; //获取系统信息 wx.getSystemInfo({ success: function (res) { canvasw = res.windowWidth; canvash = res.windowHeight; that.setData({ canvasw: canvasw }); that.setData({ canvash: canvash }); } }); this.initCanvas(); this.cleardraw(); }, //初始化函数 initCanvas: function () { context = wx.createCanvasContext('canvas'); context.beginPath() context.fillStyle = 'rgba(255, 255, 255, 0)'; context.setStrokeStyle('#000000'); context.setLineWidth(4); context.setLineCap('round'); context.setLineJoin('round'); }, canvasStart: function (event) { isButtonDown = true; arrz.push(0); arrx.push(event.changedTouches[0].x); arry.push(event.changedTouches[0].y); }, canvasMove: function (event) { if (isButtonDown) { arrz.push(1); arrx.push(event.changedTouches[0].x); arry.push(event.changedTouches[0].y); } for (var i = 0; i < arrx.length; i++) { if (arrz[i] == 0) { context.moveTo(arrx[i], arry[i]) } else { context.lineTo(arrx[i], arry[i]) } } context.clearRect(0, 0, canvasw, canvash); context.setStrokeStyle('#000000'); context.setLineWidth(4); context.setLineCap('round'); context.setLineJoin('round'); context.stroke(); context.draw(false); }, canvasEnd: function (event) { isButtonDown = false; }, //清除画布 cleardraw: function () { arrx = []; arry = []; arrz = []; context.clearRect(0, 0, canvasw, canvash); context.draw(true); }, uploadImg(){ var that = this //生成图片 wx.canvasToTempFilePath({ canvasId: 'canvas', //设置输出图片的宽高 // destWidth:150, // destHeight:150, // fileType:'jpg', quality:1.0, success: function (res) { console.log(res) // canvas图片地址 res.tempFilePath }, fail: function () { wx.showModal({ title: '提示', content: 'canvas生成图片失败。微信当前版本不支持，请更新到最新版本！', showCancel: false }); }, complete: function () {} }) },})

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