Weex之环境搭建

1.安装node（https://nodejs.org/en/download/）
2.安装weex-toolkit
注意：安装weex-toolkit时，别安装最新的，要不然会报一个叫做：

TypeError: Cannot read property 'IOSDevices' of undefined
    at Command.run (/Users/rookie/.wx/modules/node_modules/_@weex-cli_run@2.0.0-beta.1@@weex-cli/run/commands/run.js:36:33)
    at Runtime.<anonymous> (/Users/rookie/.wx/core/node_modules/_@weex-cli_core@2.0.0-beta.1@@weex-cli/core/src/runtime/run.ts:62:43)
    at Generator.next (<anonymous>)
    at <anonymous> (/Users/rookie/.wx/core/node_modules/_@weex-cli_core@2.0.0-beta.1@@weex-cli/core/lib/runtime/run.js:7:71)
    at Promise (<anonymous>)
    at __awaiter (/Users/rookie/.wx/core/node_modules/_@weex-cli_core@2.0.0-beta.1@@weex-cli/core/lib/runtime/run.js:3:12)
    at Runtime.run (/Users/rookie/.wx/core/node_modules/_@weex-cli_core@2.0.0-beta.1@@weex-cli/core/lib/runtime/run.js:23:12)
    at Cli.<anonymous> (/Users/rookie/.wx/core/node_modules/_@weex-cli_core@2.0.0-beta.1@@weex-cli/core/src/cli/cli.ts:316:44)
    at Generator.next (<anonymous>)
    at fulfilled (/Users/rookie/.wx/core/node_modules/_@weex-cli_core@2.0.0-beta.1@@weex-cli/core/lib/cli/cli.js:4:58)
    at <anonymous>

的错误，据说是最新版本的问题
3.weex环境都需要安装哪些文件，都是干嘛的？