wxml

<view class="sign">

  <view class="paper">

    <canvas class="handWriting" disable-scroll="true" bindtouchstart="touchstart1" bindtouchmove="touchmove1"  canvas-id="handWriting1">

    </canvas>

  </view>

  <view class="signBtn">

    <button size="" type="primary" bindtap="sign1ok">完成签字</button> 

    <button size="" type="warn" bindtap="reSign1">重新签字</button>

  </view>

</view>

<view class="image" hidden="{{src?false:true}}">

<image src="{{src}}" ></image>

</view>

wxss

.paper{border:1px solid #dedede; margin: 10px; height:160px }

.image{border:1px solid #dedede; margin: 10px; height:160px }

.signBtn{display: flex; margin-top:20px;}

.signTitle{ text-align: center; font-size:1.2em;margin:10px auto;}

.handWriting{width:100%}

.image image{width:100%; height:160px }

js

Page({

  data: {

    context1: null,

    hasDraw:false, //默认没有画

    src:null

  },

  onLoad: function() {

    var context1 = wx.createCanvasContext("handWriting1");

    context1.setStrokeStyle("#000000")

    context1.setLineWidth(3);

    this.setData({

      context1: context1,

    })

  },

  touchstart1: function(e) {

    var context1 = this.data.context1;

    context1.moveTo(e.touches[0].x, e.touches[0].y);

    this.setData({

      context1: context1,

      hasDraw : true, //要签字了

    });

  },

  touchmove1: function(e) {

    var x = e.touches[0].x;

    var y = e.touches[0].y;

    var context1 = this.data.context1;

    context1.setLineWidth(3);

    context1.lineTo(x, y);

    context1.stroke();

    context1.setLineCap("round");

    context1.draw(true);

    context1.moveTo(x, y);

  },

  reSign1: function() { //重新画

    var that = this;

    var context1 = that.data.context1;

    context1.draw(); //清空画布

    that.setData({

      hasDraw: false, //没有画

      src: null

    });

  },

  sign1ok: function () {

    var that = this;

    if(!that.data.hasDraw){

      console.log("签字是空白的 没有签字")

    }else{

      var context1 = that.data.context1;

      context1.draw(true, wx.canvasToTempFilePath({

        canvasId: "handWriting1",

        success(res) {

          console.log(res.tempFilePath) //得到了图片下面自己写上传吧

          that.setData({

            src: res.tempFilePath

          })

        }

      }))

    }

  },

});

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