小程序下载文件

/**

 * 下载文件并预览

 */

downloadFile:function(e){
    var index = e.currentTarget.dataset.index;//获取当前长按图片下标
    let url=this.data.files[index]['path'];
    wx.downloadFile({
        url: url,
        header: {},
        success: function(res) {
            var filePath = res.tempFilePath;
            wx.openDocument({
                filePath: filePath,
                success: function (res){
                    console.log('打开文档成功')
                },
                fail: function (res){
                    console.log(res);
                },
                complete:function (res){
                    console.log(res);
                }
            })
        },
        fail: function(res) {
            console.log('文件下载失败');
        },
        complete: function(res) {},
    })
},