微信小程序通知验证签名方法
微信小程序实现电子签名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
<view class="sign-contain">
<view class="signName">
<canvas id="canvas" canvas-id="canvas" class="{{ sysType === 'iOS' ? 'canvas' : 'canvas bg000'}}" disable-scroll="true" bindtouchstart="canvasStart" bindtouchmove="canvasMove" bindtouchend="canvasEnd" touchcancel="canvasEnd" binderror="canvasIdErrorCallback"></canvas>
</view>
<view class="btn-wrap">
<button catchtap="cleardraw">清除签名</button>
<button catchtap="uploadImg">上传签名</button>
</view>
</view>
js：
var context = null;// 使用 wx.createContext 获取绘图上下文 context
var 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: {
canvasw: '',
canvash: '',
imgUrl: '',
info: {},
signBase64: '',
sysType: '' // 判断机型
},
onLoad: function (options) {
let that = this
let res = wx.getSystemInfoSync()
const system = res.system.split(' ')
that.setData({
sysType: system[0],
})
let params = JSON.parse(options.params)
that.setData({
info: params,
})
that.startCanvas();
that.initCanvas()
},
/**
* 以下 - 手写签名 / 上传签名
*/
startCanvas() {//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() {
context = wx.createCanvasContext('canvas');
context.beginPath()
if(this.data.sysType === 'iOS') {
context.fillStyle = 'rgba(255, 255, 255, 1)';
context.setStrokeStyle('#444');
} else {
context.fillStyle = 'rgba(0, 0, 0, 1)';
context.setStrokeStyle('#aaa');
}
context.setLineWidth(4);
context.setLineCap('round');
context.setLineJoin('round');
},
canvasStart(event) {
isButtonDown = true;
arrz.push(0);
arrx.push(event.changedTouches[0].x);
arry.push(event.changedTouches[0].y);
},
canvasMove(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);
if(this.data.sysType === 'iOS') {
context.fillStyle = 'rgba(255, 255, 255, 1)';
context.setStrokeStyle('#444');
} else {
context.fillStyle = 'rgba(0, 0, 0, 1)';
context.setStrokeStyle('#aaa');
}
context.setLineWidth(3);
context.setLineCap('round');
context.setLineJoin('round');
context.stroke();
context.draw(false);
},
canvasEnd(event) {
isButtonDown = false;
},
//清除画布
cleardraw() {
arrx = [];
arry = [];
arrz = [];
context.clearRect(0, 0, canvasw, canvash);
if(this.data.sysType === 'iOS') {
context.fillStyle = 'rgba(255, 255, 255, 1)';
context.setStrokeStyle('#444');
} else {
context.fillStyle = 'rgba(0, 0, 0, 1)';
context.setStrokeStyle('#aaa');
}
context.draw(true);
},
uploadImg() {
var that = this
//生成图片
// context.draw(true,()=> {
setTimeout(() => {
wx.canvasToTempFilePath({
canvasId: 'canvas',
//设置输出图片的宽高
fileType: 'jpg',
quality: 1,
success: function (res) {
// canvas图片地址 res.tempFilePath
let imgBase64 = wx.getFileSystemManager().readFileSync(res.tempFilePath, 'base64')
that.setData({
imgUrl: res.tempFilePath,
signBase64: imgBase64
})
that.submitSign()
console.log('imgBase64', 'data:image/jpeg;base64,' + imgBase64)
// wx.saveImageToPhotosAlbum({
// filePath: res.tempFilePath,
// success(res4) {
// console.log(res,'保存res4');
// wx.showToast( {
// title: '已成功保存到相册',
// duration: 2000
// } );
// }
// })
},
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 () { }
}, 5000)
})
// })
},
// 提交签名
submitSign() {
let that = this
wx.showLoading({
title: '正在提交...',
mask: true
})
let type = '1'
if(that.data.sysType === 'iOS') {
type = '0'
} else {
type = '1'
}
wx.$getWxLoginCode(resp => {
const params = {
qmbase64: that.data.signBase64,
}
console.info("入参", params)
wx.kservice.yyyurl(params, res => {
wx.hideLoading()
if (res.statusCode === '200') {
wx.showModal({
title: '提示',
content: res.message,
showCancel: false,
confirmText: '返回首页',
success(res) {
if (res.confirm) {
wx.reLaunch({
url: '/pages/index/index'
})
}
}
})
} else {
wx.showModal({
title: '提示',
content: res.message,
showCancel: true,
cancelText: '返回首页',
confirmText: '重新提交',
success: (result) => {
if (result.cancel) {
// 取消停留
wx.reLaunch({
url: '/pages/index/index'
})
} else if (result.confirm) {
//重新提交
that.submitSign()
}
},
});
}
}, {}, true, true)
})
},
/**
* 生命周期函数--监听页面卸载
*/
onUnload: function () {
},
/**
* 页面相关事件处理函数--监听用户下拉动作
*/
onPullDownRefresh: function () {
},
/**
* 页面上拉触底事件的处理函数
*/
onReachBottom: function () {
},
/**
* 用户点击右上角分享
*/
onShareAppMessage: function () {
}
})
CSS：
.sign-contain {
display: flex;
flex-direction:column;
width: 100%;
height: 100%;
}
.signName {
flex: 1;
}
.canvas {
width: 100%;
height: 100%;
}
.bg000{
background-color: #000;
}
.btn-wrap{
display: block;
width:100%;
height: 100rpx;
margin: 20rpx 0;
position: relative;
}
.btn-wrap button{
width: 43%;
}
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