imageOnLoad(ev) { console.log(ev); var _this = this; //放大镜效果 var bannerUrl = _this.data.url_com + _this.data.bannerUrl; var wImg = ev.detail.width; var hImg = ev.detail.height; var width = parseFloat(_this.data.width); console.log(bannerUrl); console.log(wImg); console.log(hImg); console.log(width); var ctx = wx.createCanvasContext('myCanvas'); ctx.drawImage(bannerUrl, 0, 0, wImg, hImg, 0, 0, width, width); ctx.draw(); }, [图片] [图片] 域名配置好了，图片是加载完成才绘制的 求大神帮我解答一下！！！！！！！！！！！！！！！！！