text: var express = require('express')
  var app = express()
  const opn=require('opn')
  const path=require('path')
  const root=path.resolve(__dirname,'../packages/tools')
  function filePath(file){
      return path.resolve(root,file)
  }
  app.use(express.static('./packages/tools/dist'))
  app.get('/', function (req, res) {
    res.sendFile(filePath('./exmaple/obserable.test.html'))
  })
  
  app.listen(3000,()=>{
      opn('http://localhost:3000', {app: 'chrome'});
  })