微信的小程序報(bào)錯(cuò)is not defined
具體報(bào)錯(cuò)：thirdScriptError
shangchuan is not defined;at pages/box42/box42 page test function
ReferenceError: shangchuan is not defined

程序代碼
Page({
data: {
shangchuan:'https://cloud-minapp-8606.clo...',
},
test:function(){

var that = this;
var context = wx.createCanvasContext('mycanvas');//畫布ID
// var path = "/images/bankcard.jpg";
context.drawImage(shangchuan, 0, 0, 686, 686);//畫布的大小

//繪制圖片

context.draw();

},
})