vue 七牛云base64上传

      methods:{
              //七牛云base64上传
            base64(pic){
                var than = this;
                //pic base64字符串
                this.getQiniuToken({}).then((res)=>{
                    if(res.code==0){
                        var token = res.data;
                        pic = pic.replace(/^.*?,/,'');
                        var url = "http://upload.qiniu.com/putb64/"+this.fileSize(pic)+"/"+window.btoa("0612_"+ new Date().getTime()+"_"+parseInt(Math.random()*10)); //非华东空间需要根
                        var xhr = new XMLHttpRequest();
                        xhr.onreadystatechange=function(){
                            if (xhr.readyState==4){
                                //上传成功返回的数据
                                var res = JSON.parse(xhr.responseText);
                                console.log(res );
                            }
                        }
                        xhr.open("POST", url, true);
                        xhr.setRequestHeader("Content-Type", "application/octet-stream");
                        //此处UpToken 后面带空格
                        xhr.setRequestHeader("Authorization", "UpToken "+token);
                        xhr.send(pic);
                    }
                });
                
            },
            fileSize(str){
                if (str.indexOf('=') > 0) {
                    var indexOf = str.indexOf('=');
                    str = str.substring(0,indexOf);
                }
                return parseInt(str.length - (str.length / 8) * 2)
            },
      }