// 第一步
cnpm install babel-plugin-transform-object-rest-spread

{
 "presets": [
 ["env", {
 "modules": false,
 "targets": {
 "browsers": ["> 1%", "last 2 versions", "not ie <= 8"]
 }
 }],
 "stage-2"
 ],
 "presets": [
 ["es2015", { "modules": false }]
 ],
 "plugins": ["transform-object-rest-spread"]
}

cnpm install babel-preset-es2015 --save-dev