详解Vue 的异常处理机制

import config from '../config'
import { warn } from './debug'
import { inBrowser } from './env'

export function handleError (err: Error, vm: any, info: string) {
 if (vm) {
  let cur = vm
  while ((cur = cur.$parent)) {
   const hooks = cur.$options.errorCaptured
   if (hooks) {
    for (let i = 0; i < hooks.length; i++) {
     try {
      const capture = hooks[i].call(cur, err, vm, info) === false
      if (capture) return
     } catch (e) {
      globalHandleError(e, cur, 'errorCaptured hook')
     }
    }
   }
  }
 }
 globalHandleError(err, vm, info)
}

function globalHandleError (err, vm, info) {
 if (config.errorHandler) {
  try {
   return config.errorHandler.call(null, err, vm, info)
  } catch (e) {
   logError(e, null, 'config.errorHandler')
  }
 }
 logError(err, vm, info)
}

function logError (err, vm, info) {
 if (process.env.NODE_ENV !== 'production') {
  warn(`Error in ${info}: "${err.toString()}"`, vm)
 }
 /* istanbul ignore else */
 if (inBrowser && typeof console !== 'undefined') {
  console.error(err)
 } else {
  throw err
 }
}