webpack常见js方法

1. 二维数组转一维

   //errors是二维数组[[1，2]，[3，4]] => [1,2,3,4]

   errors.reduce((arr, items) => arr.concat(items), [])

2. 设置获取对象键值

   //安全获取obj.a.b.c getProperty(obj,'a.b.c'),若obj.a.b.c获取不到则为undefined

   const getProperty = (obj, path) => {

   let name = path.split('.')

   for (let i = 0; i < name.length - 1; i++) {

   obj = obj[name[i]]

   if (typeof obj !== 'object' || !obj || Array.isArray(obj)) return

   }

   return obj[name.pop()]

   }

   //设置obj.a.b.c=value;若某个值不是对象或者为空、数组,则设置失败

   const setProperty = (obj, path, value) => {

   let name = path.split('.')

   for (let i = 0; i < name.length - 1; i++) {

   if (typeof obj[name[i]] !== 'object' && obj[name[i]] !== undefined)

   return

   if (Array.isArray(obj[name[i]])) return

   if (!obj[name[i]]) obj[name[i]] = {}

   obj = obj[name[i]]

   }

   obj[name.pop()] = value

   }