阿里云oss js直接上传方式

https://help.aliyun.com/document_detail/31925.html?spm=a2c4g.11186623.6.634.lNfXyE

上来就让我下载插件什么鬼。堂堂阿里，竟然给这种demo。

image.png

原生的行数会很多吗？

.then(sign=>{
    //这里使用服务器签名方式，假设已经拿到服务器签名信息
    let _date = new Date() * 1;
    let file = fileItem.blob;
    let data = new FormData();
    data.append("Filename",`${sign.dir}/${_date}`);
    data.append("key",`${sign.dir}/${_date}`);
    data.append("policy",sign.policy);
    data.append("OSSAccessKeyId",sign.accessid);
    data.append("success_action_status",200);
    data.append("signature",sign.signature);
    data.append('file', file, fileItem.filename || file.name)        
    var xhr = new XMLHttpRequest();
    xhr.setRequestHeader("Content-Type","multipart/form-data");
    xhr.open("post", sign.host)
    xhr.onreadystatechange = function() {
          if (xhr.readyState == 4) {
                console.log("success:" + xhr.response);
                //这里响应体是空的
          }
     }
})