最近接手别人的一个项目，其中有一个按钮显示不出来也不报错，困扰了我好久，原来是iview的版本问题。
后来我发现npm install的时候 iview版本自动更新到最新的版本，我只好npm install后再下载自己需要的版本号。
cnpm install iview@2.0.0-rc.11 --save
'~'（波浪符号）:他会更新到当前minor version（也就是中间的那位数字）中最新的版本。放到我们的例子中就是："exif-js": "~2.3.0"，这个库会去匹配更新到2.3.x的最新版本，如果出了一个新的版本为2.4.0，则不会自动升级。波浪符号是曾经npm安装时候的默认符号，现在已经变为了插入符号。
'^'（插入符号）: 这个符号就显得非常的灵活了，他将会把当前库的版本更新到当前major version（也就是第一位数字）中最新的版本。放到我们的例子中就是："vue": "^2.2.2", 这个库会去匹配2.x.x中最新的版本，但是他不会自动更新到3.0.0。
‘2.0.0-rc.11’如果直接写版本号，就会下载到当时依赖的版本。
但是如果有一些依赖在后期修改了存在的bug，如果还用之前的依赖，没准就会报错。
所以推荐使用"^"的写法。
只有极个别的依赖对低版本的语法是不支持的，比如iview到2018-08-13日已经有153个版本。
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其中最坑的是iview中，表格渲染的render函数，
2.0.0-rc版本和其他2.0+版本用法完全不同。
在2.0.0-rc和以前的版本，render接收两个参数，如今render接收三个参数。且行且珍惜...
