[移动开发]微信小程序下载pdf更改名称并打开

//url=https://xxxx.pdf 
wx.request({
        url: url,
        data:data,
        responseType:"arraybuffer",
        success (res) {
         if(res.header["Content-Type"].indexOf("application/pdf")!=-1){
              var save = wx.getFileSystemManager();
    let pdfname='aaaa.pdf'
           let filePath = wx.env.USER_DATA_PATH + '/' + pdfname;
 save.writeFile({
            filePath: filePath,
            data: res.data,
            success: res => {
              console.log("bbbbb", res);
       
              wx.openDocument({
                filePath: filePath ,
                showMenu:"true",
                fileType:"pdf",
                success: function (res) {
                  console.log('open doc success')
                },
                fail: function (res) {
                  clearInterval(icount)
                  console.log('open doc failed',res);
                },
                complete: function (res) {
                  wx.hideLoading();
                }
              })
            }
          })
         }
        }
})