为了防止意外，首先在conda创建一个新环境并激活：

conda create -n tf2 python=3.5
conda install -n tf2 anaconda
activate tf2

根据TensorFlow 2.0 Beta，用pip安装tf2.0：

pip install tensorflow==2.0.0-beta1 

遇到报错，

ERROR: tb-nightly 1.14.0a20190603 has requirement setuptools>=41.0.0, but you'll have setuptools 39.1.0 which is incompatible.

根据在Windows平台下载及安装 TensorFlow，需要更新setuptools

pip install --upgrade setuptools
pip install tensorflow==2.0.0-beta1 

再次遇到报错

ERROR: Cannot uninstall 'wrapt'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.

用Cannot uninstall 'html5lib'. It is a distutils installed project and thus we cannot accurately的方法解决了，记住这里删除的路径不是anaconda3，而是C:\Users\Lenovo\.conda\envs\tf2.0\Lib\site-packages，删掉了egg-info之后再安装，成功。
测试是否安装成功：

>>>import tensorflow as tf
>>>from tensorflow.keras import layers
>>>print(tf.__version__)
2.0.0-beta1
>>>print(tf.keras.__version__)
2.2.4-tf

启动jupyter notebook后也成功得到一样结果：

在surface上安装tf2.0

在surface上安装的时候遇到一直下载不下来的情况，于是直接下载whl：tensorflow-2.0.0b1-cp35-cp35m-win_amd64.whl
然后用pip安装

pip install tensorflow-2.0.0b1-cp35-cp35m-win_amd64.whl

也遇到了一样的报错，这边egg-info的路径是C:\Users\konat\Anaconda3\envs\tf2\Lib\site-packages，不知道为什么和电脑上不一样。