个人感觉forEach有点奇怪

Discuss / JavaScript / 个人感觉forEach有点奇怪

Back

Topic source

#1 Created at ... [Delete] [Delete and Lock User]

forEach 既不会返回新的数组，也不会改变原有的数组元素内容，那么它遍历可以干嘛？

#2 Created at ... [Delete] [Delete and Lock User]

对数组“解剖”，或许你需要它里面符合条件的元素呢，遍历、挑选、择出

#3 Created at ... [Delete] [Delete and Lock User]

就是一个迭代器，要实现什么功能由你自己在里面写的函数决定。

#4 Created at ... [Delete] [Delete and Lock User]

同样不理解forEach 的用处，谁能用一段代码说明一下吗？除了作者举例的console.log

#5 Created at ... [Delete] [Delete and Lock User]

你的for循环怎么写forEach就怎么写

比如群发email：

for (let u in users) {
    sendMail(u.email, u.name);
}

users.forEach(u => {
    sendMail(u.email, u.name);
});

#6 Created at ... [Delete] [Delete and Lock User]

你想干嘛干嘛