js">downloadFile() {
       var content = JSON.parse(sessionStorage.getItem('content'))
       var ind = content.filter(item => {
         return item.id === this.offlineIds * 1
       })
        let uri = 'data:text/csv;charset=utf-8,\ufeff' + encodeURIComponent(this.contentJson)  //this.contentJson下载的内容
        //通过创建a标签实现
        let link = document.createElement("a")
        link.href = uri;
        //对下载的文件命名
        link.download =  ind[0].name + '.json'
        document.body.appendChild(link)
        link.click()
        document.body.removeChild(link)
    }