downLoadFile (url, name) {                this.xhr = new XMLHttpRequest()                this.xhr.open('GET', url, true)                this.xhr.responseType = 'blob'                var vmThis = this                this.xhr.onload = () => {                    if (this.xhr.status === 200) {                        if (this.xhr.response && this.xhr.response.size && this.xhr.response.size > 0) {                            let file = this.xhr.response                            let fileName = name                            if ('msSaveOrOpenBlob' in navigator) {                                window.navigator.msSaveOrOpenBlob(file, fileName)                            } else {                                let fileUrl = window.URL.createObjectURL(file)                                let a = document.createElement('a')                                a.download = fileName                                a.href = fileUrl                                document.getElementsByTagName('body')[0].appendChild(a)                                a.click()                                a.parentNode.removeChild(a)                                window.URL.revokeObjectURL(fileUrl)                            }                        }                    } else {                        //                    }                }                this.xhr.setRequestHeader('x-manage-token', this.$store.state.userInfo.data.sessionId)                this.xhr.send()            },

this.downLoadFile(this.url+'/authc/jzmOrder/exportJzmOrder','')

url 是后端接口全路劲    name 导出文件名称