图片地址怎么转成base64传给后台

wx.chooseImage({
    success:function(res){
        wx.request({
            url:res.tempFilePaths[0],
            method:‘GET’,
            responseType:‘arraybuffer’,
            success:function(res){
                var base64 = ‘data:image/jpg;base64,’ +  wx.arrayBufferToBase64(res.data);
                console.log(base64);
            }
        });
    }
})

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不用转，直接传