From 1b70fc3777c7a37284c40ec2e96d42c72631c7b1 Mon Sep 17 00:00:00 2001
From: dp~ <457509824@qq.com>
Date: Mon, 23 Oct 2017 22:48:04 +0800
Subject: [PATCH] =?UTF-8?q?=E6=95=B0=E7=BB=84.find=20&&=20.findIndex=20&&?=
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+# 更多 `Array` 方法使用
+```
+const inventory = [
+    { name: 'apples', quantity: 2 },
+    { name: 'bananas', quantity: 0 },
+    { name: 'cheeries', quantity: 3 }
+]；
+```
+
+* .find()
+返回找到的元素，参数传入一个回调函数，函数里面三个参数分别是 `element`,`index`,`array`
+
+如果要在数组中寻找某个元素，可以使用循环，但是 `forEach` 中途不能打断，性能相对劣，`for of`可读性相对劣
+
+```
+const bananas = inventory.find(fruit => fruit.name === 'bananas');
+```
+
+* .findIndex()
+类似 `.find()`,区别在于返回的是元素的索引
+
+```
+const bananas = inventory.findIndex(fruit => fruit.name === 'bananas');
+```
+
+* .some()
+数组满足测试函数条件，返回 `true`
+```
+const bananas = inventory.find(fruit => fruit.quantity > 0); // true
+```
+
+* .every()
+数组满足所有测试函数条件，返回 `true`
+```
+const bananas = inventory.every(fruit => fruit.quantity > 0); // false
+```