Angular 2在更改后未更新浏览器

[0] 9:23:22 AM – 检测到文件更改.开始增量编译……

[0] 9:23:23 AM – 编译完成.注意文件更改.

[1] [BS]文件已更改：app / components / logo / logo.component.js

[1] [BS]文件已更改：app / components / navBar / navbar.component.js

[1] [BS]文件已更改：app / components / sideBar / sidebar.component.js

…

但它不再自动更新我的网页浏览器(屏幕显示为“正在加载…”消息:(我不知道为什么.

这是我的package.json

{
  "name": "room","version": "1.0.0","scripts": {
"start": "concurrently "npm run tsc:w" "npm run lite"  ","tsc": "tsc","tsc:w": "tsc -w","lite": "lite-server","typings": "typings","postinstall": "typings install","build-master-sass": "node-sass -w style.scss style.css","build-children-sass": "node-sass -w -r app/css -o app/css","lint" : "tslint app/**/*.ts"
},"license": "ISC","dependencies": {
"angular2": "2.0.0-beta.7","systemjs": "0.19.22","es6-promise": "^3.1.2","es6-shim": "^0.33.4","reflect-metadata": "0.1.2","rxjs": "5.0.0-beta.2","zone.js": "0.5.15","ng2-bootstrap": "1.0.5","bootstrap-material-design-icons" : "2.2.0"
},"devDependencies": {
"concurrently": "^2.0.0","lite-server": "^2.1.0","typescript": "^1.8.2","typings": "^0.6.8"
}
}

有什么建议 ？