angular forEach方法遍历源码解读

function forEach(obj, iterator, context) {
 var key, length;
 if (obj) {
  if (isFunction(obj)) {
   for (key in obj) {
    // Need to check if hasOwnProperty exists,
    // as on IE8 the result of querySelectorAll is an object without a hasOwnProperty function
    if (key != 'prototype' && key != 'length' && key != 'name' && (!obj.hasOwnProperty || obj.hasOwnProperty(key))) {
     iterator.call(context, obj[key], key, obj);
    }
   }
  } else if (isArray(obj) || isArrayLike(obj)) {
   var isPrimitive = typeof obj !== 'object';
   for (key = 0, length = obj.length; key < length; key++) {
    if (isPrimitive || key in obj) {
     iterator.call(context, obj[key], key, obj);
    }
   }
  } else if (obj.forEach && obj.forEach !== forEach) {
    obj.forEach(iterator, context, obj);
  } else if (isBlankObject(obj)) {
   // createMap() fast path --- Safe to avoid hasOwnProperty check because prototype chain is empty
   for (key in obj) {
    iterator.call(context, obj[key], key, obj);
   }
  } else if (typeof obj.hasOwnProperty === 'function') {
   // Slow path for objects inheriting Object.prototype, hasOwnProperty check needed
   for (key in obj) {
    if (obj.hasOwnProperty(key)) {
     iterator.call(context, obj[key], key, obj);
    }
   }
  } else {
   // Slow path for objects which do not have a method `hasOwnProperty`
   for (key in obj) {
    if (hasOwnProperty.call(obj, key)) {
     iterator.call(context, obj[key], key, obj);
    }
   }
  }
 }
 return obj;
}

   var values = {name: 'misko', gender: 'male'};
   var log = [];
   angular.forEach(values, function(value, key) {
    this.push(key + ': ' + value);
   }, log);