drawCanvas(){
    var self = this;
    var imgsrcArray = [
        require('@/page/agent/agentexpand/img/bg.jpg'),'data:image/jpeg;base64,'+.codeUrl
    ];
    var canvas = document.createElement('canvas');
    var ctx = canvas.getContext('2d');
    canvas.width = 750;
    canvas.height = 1333var imglen = imgsrcArray.length;
    var drawimg = (function f(n){
        if(n < imglen){
            var img = new Image();
            img.crossOrigin = 'Anonymous'; //解决跨域问题
            img.onload = (){
                ctx.save();
                if(n == 0){
                    ctx.drawImage(img,0,750,1333);
                }else{
                    ctx.drawImage(img,466,574,210,210);
                }
                f(n+1);
            }
            
            img.src = imgsrcArray[n];
        }{
            self.downloadUrl = canvas.toDataURL("image/jpeg");
            self.downloadUrl = self.downloadUrl.replace("data:image/jpeg;base64,","");
        }
    })(0);
}

<img :src="'data:image/jpeg;base64,' + downloadUrl"/>