微信小程序实现手写签名(签字版)_javascript技巧_

                        完成签字      重新签字   

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           })                    }       }))     }   }, });

.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 }