react native命令行全局安装

命令行npm install -g react-native-cli

rn的架构图：

C:\MyApp\node-v10.16.3-win-x64\node_modules\react-native-cli

这个index.js里有很多有用的信息，当遇到react native的各种错误时，搞清楚他们的原理有助于问题定位：

rn需要的依赖库：

'use strict';

var fs = require('fs');
var path = require('path');
var exec = require('child_process').exec;
var execSync = require('child_process').execSync;
var chalk = require('chalk');
var prompt = require('prompt');
var semver = require('semver');

// Use Yarn if available, it's much faster than the npm client.
// Return the version of yarn installed on the system, null if yarn is not available.
function getYarnVersionIfAvailable() {

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