今天關於微信小程式的畫布，做了個簡單的範例，大家來看看吧
wxml的程式碼

<canvas style="width: 300px; height: 200px;" canvas-id="fourCanvas" bindtouchstart="start" bindtap="click" >畫布效果</canvas>

js程式碼

Page({
   data:{
     canvaid:'fourCanvas',
     num:'1'
   },
  canvasIdErrorCallback: function (e) {
    console.error(e.detail.errMsg)
  },
  click:function
 
(){
    var nums=this.data.num;
    nums++;
    if(nums%2==0){
    var context = wx.createContext()
    context.setStrokeStyle("#00ff00")
    context.setLineWidth(5)
    context.rect(0, 0, 200, 200)
    context.stroke()
    context.setStrokeStyle("#ff0000")
    context.setLineWidth(2)
    context.moveTo(160, 100)
    context.arc(100
 
, 100, 60, 0, 2 * Math.PI, true)
    context.moveTo(140, 100)
    context.arc(100, 100, 40, 0, Math.PI, false)
    context.moveTo(85, 80)
    context.arc(80, 80, 5, 0, 2 * Math.PI, true)
    context.moveTo(125, 80)
    context.arc(120, 80, 5, 0, 2 * Math.PI, true)
    context.stroke()
    }else{
    var context = wx.createContext()
    context.setStrokeStyle("#00ff00"
 
)
    context.setLineWidth(5)
    context.rect(0, 0, 200, 200)
    context.stroke()
    context.setStrokeStyle("#ff0000")
    context.setLineWidth(2)
    context.moveTo(160, 103)
    context.arc(100, 100, 60, 0, 2 * Math.PI, true)
    context.moveTo(59, 137)
    context.arc(100, 135, 40, 3.2,  Math.PI, false)
    context.moveTo(84, 83)
    context.arc(80, 80, 5, 0, 2 * Math.PI, true)
    context.moveTo(124, 79)
    context.arc(120, 80, 5, 0, 2 * Math.PI, true)
    context.stroke()
    } 
    wx.drawCanvas({
      canvasId: this.data.canvaid,
      actions: context.getActions() 
    })
    this.setData({
      num:nums
   })
  },
  onReady: function (e) {
    var context = wx.createContext()
    context.setStrokeStyle("#00ff00")
    context.setLineWidth(5)
    context.rect(0, 0, 200, 200)
    context.stroke()
    context.setStrokeStyle("#ff0000")
    context.setLineWidth(2)
    context.moveTo(160, 103)
    context.arc(100, 100, 60, 0, 2 * Math.PI, true)
    context.moveTo(59, 137)
    context.arc(100, 135, 40, 3.2,  Math.PI, false)
    context.moveTo(84, 83)
    context.arc(80, 80, 5, 0, 2 * Math.PI, true)
    context.moveTo(124, 79)
    context.arc(120, 80, 5, 0, 2 * Math.PI, true)
    context.stroke()
    wx.drawCanvas({
      canvasId: this.data.canvaid,
      actions: context.getActions() 
    })
  }
})

這個對小程式的小白來說，也是很簡單的，接下來給大家發效果圖吧！

點選後的效果圖（可以重複 無限次數的點選哦）

若有不懂的地方，可以在下方評論，也可以掃描下方二維碼進行討論