export function forEach (obj, fn) {
  // Don't bother if no value provided
  if (obj === null || typeof obj === 'undefined') {
    return
  }

  // Force an array if not already something iterable
  if (typeof obj !== 'object') {
    /*eslint no-param-reassign:0*/
    obj = [obj]
  }

  if (isArray(obj)) {
    // Iterate over array values
    for (var i = 0, l = obj.length; i < l; i++) {
      fn.call(null, obj[i], i, obj)
    }
  } else {
    // Iterate over object keys
    for (var key in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, key)) {
        fn.call(null, obj[key], key, obj)
      }
    }
  }
}
export function deepMerge(/* obj1, obj2, obj3, ... */) {
  let result = {}
  function assignValue(val, key) {
    if (typeof result[key] === 'object' && typeof val === 'object') {
      result[key] = deepMerge(result[key], val)
    } else if (typeof val === 'object') {
      result[key] = deepMerge({}, val)
    } else {
      result[key] = val
    }
  }
  for (let i = 0, l = arguments.length; i < l; i++) {
    forEach(arguments[i], assignValue)
  }
  return result
}

/**    
 * 遍历    
 * @param {object|array} obj 要迭代的对象    
 * @param {function} fn 为每个项调用的回调    
 */    
export function forEach(obj, fn) {    
if (obj === null || typeof obj === 'undefined') return    
if (typeof obj !== 'object') obj = [obj]    
if (Object.prototype.toString.call(obj) === '[object Array]') {    
for (let i = 0, l = obj.length; i < l; i++) {    
fn.call(null, obj[i], i, obj)    
}    
} else {    
for (const k in obj) {    
if (Object.prototype.hasOwnProperty.call(obj, k)) {    
fn.call(null, obj[k], k, obj)    
}    
}    
}    
}    
/**    
 * 对象深合并    
 * @param  {...object} args 对象    
 * @returns {object} 合并后的对象    
 */    
export function merge(...args) {    
let result = {}    
for (let i = 0, l = args.length; i < l; i++) {    
forEach(    
args[i] || {},    
(val, key) =>    
(result[key] =    
typeof result[key] === 'object' && typeof val === 'object'    
? merge(result[key], val)    
: val)    
)    
}    
return result    
}