angular中提供了forEach()方法用于遍历对象或数组，供大家参考，具体内容如下
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;
}
官方描述：
forEach方法可以遍历数组或对象，函数有三个参数为别为：value，key,obj。
1）、value value指当遍历的对象或数组元素当前的值
2)、 key 是对象属性的的key或者数组的索引
3)、 obj obj即被遍历的对象或数组本身
示例：
var values = {name: 'misko', gender: 'male'};
var log = [];
angular.forEach(values, function(value, key) {
this.push(key ': ' value);
}, log);
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持Devmax。