js 获取图片url的Blob值并预览

//获取图片的Blob值
functiongetImageBlob(url, cb) {
    var xhr          = newXMLHttpRequest();
    xhr.open("get", url, true);
    xhr.responseType = "blob";
    xhr.onload       = function() {
        if (this.status == 200) {
            if(cb) cb(this.response);
        }
    };
    xhr.send();
}

functionpreView(url){
    let reader    = newFileReader();
    getImageBlob( url , function(blob){
        reader.readAsDataURL(blob);
    });
    reader.onload = function(e) {
        var img = document.createElement("img");
        img.src =e.target.result;
        document.body.appendChild(img);
    }
}