解决办法：使用escape进行文件名编码
uni.downloadFile({
url: url,
success: function(res) {
var filePath = res.tempFilePath;
//打开文件有效值 doc, xls, ppt, pdf, docx, xlsx, pptx
uni.openDocument({
filePath: escape(filePath),
success: function(res) {
uni.hideLoading();
that.downloadFile_onoff = true;
},
fail() {
uni.showToast({
title: '暂不支持此类型',
duration: 2000
});
uni.hideLoading();
that.downloadFile_onoff = true;
}
});
}
});