按照官网的推荐指令进行安装：

依次执行
git clone https://github.com/zsh-users/zsh-autosuggestions ~/.zsh/zsh-autosuggestions

git clone https://github.com/zsh-users/zsh-syntax-highlighting.git

echo "source ${(q-)PWD}/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh" >> ${ZDOTDIR:-$HOME}/.zshrc

打开.zshrc脚本文件
vim ~/.zshrc

在.zshrc末尾添加以下两行命令

source ~/.zsh/zsh-autosuggestions/zsh-autosuggestions.zsh
source ./zsh-syntax-highlighting/zsh-syntax-highlighting.zsh

执行：
source ~/.zshrc