plus.net.XMLHttpRequest报错：ReferenceError: Can't find variable: location 怎么破？

场景：选择本地视频后，获取文件信息，方便上传到华为云OBS
安卓真机测试

开始使用的是js的XMLHttpRequest，报TypeError，XMLHttpRequest is not defined.搜索社区后，应该是跨域问题，建议使用plus.net.XMLHttpRequest。但仍然报错，而且没看到类似的问答。代码如下：

//获取本地视频  
            select_video(){  
                var _this = this;  
                uni.chooseVideo({  
                    maxDuration:30,  //拍摄视频最长拍摄时间，单位秒  
                    count:1, //上传视频的数量  
                    sourceType:['camera','album'],  
                    success: (res) => {  
                        var timestamp = Date.parse(new Date()).valueOf();  
                        console.log(timestamp)  
                        _this.preview_video = res.tempFilePath;  
                        var xhr = new plus.net.XMLHttpRequest();  
                        xhr.open('GET', res.tempFilePath, true);  
                        xhr.setRequestHeader("Content-type", "application/json; charset=utf-8");  
                        xhr.responseType = 'blob';  
                        xhr.onload = function(e) {  
                            if (this.status == 200) {  
                                _this.video_src = this.response;  
                                _this.video_name = timestamp + '.' + _this.video_src.type.split("/")[1];  
                                console.log(_this.preview_video)  
                                console.log(_this.video_src)  
                                console.log(_this.video_name)  
                                _this.selected = true;  
                                _this.is_video = 1;  
                            }  
                        };  
                        xhr.send();  
                    },  
                })  
            },  

真机测试时，控制台打印：

09:57:48.315 App Hide at App.vue:10
09:57:52.182 App Show at App.vue:7
09:57:52.257 [Number] 1592531873000 at pages/release/release.vue:169
09:57:52.282 ReferenceError: Can't find variable: location
10:02:52.297 App Hide at App.vue:10