关于es6:ES6和JS进阶新的集合对象

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Map

需要：依据同学的名字查找对应的问题

思考：数组实现（略）

var m = new Map([[‘ 小程 ’, 95], [‘ 老赵 ’, 75], [‘ 两开花 ’, 85]]); m.get(‘ 两开花 ’);

或者：

var m = new Map(); // 空 Map m.set(‘ 小鱼 ’, 67); // 增加新的 key-value

其余操作：

m.has(‘ 小鱼 ’); // 是否存在 key ‘ 小鱼 ’: true m.get(‘ 小鱼 ’); // 67 m.delete(‘ 小鱼 ’); // 删除 key ‘ 小鱼 ’ m.size; // 汇合元素数量

_@猜一猜 @_：如果 key 值呈现反复？

var m = new Map([[‘ 小程 ’, 95], [‘ 小程 ’, 75], [‘ 两开花 ’, 85]]);

@想一想 @：这样好不好？

数组解构赋值

var [name, age, female] = [‘ 飞哥 ’, 38, true]; if (female) {alert(${age} 岁的 ${name} 真汉子 ); }

Set

不能反复，反复的值会被主动过滤掉

var s = new Set([1, 2, 3, 3, ‘3’]);

也能够先 new 一个空的 Set

  • length/size
  • add()
  • delete()
  • has()

留神：比拟两个援用对象是否雷同

（演示，略……）

iterable

温习：for… of（区别于 for…in）：只取汇合元素，不取属性

应用 forEach() 回调函数：

var m = new Map([[1, ‘x’], [2, ‘y’], [3, ‘z’]]); m.forEach(function (value, key, map) {console.log(value); });

for…in

或者是为了模仿其余语言（如 C# 的 foreach），JavaScript 推出了 for…in 循环，能够：

  • 遍历对象的全副属性

    for (var i in student) {console.log(i); // 想一想如何取到每个元素的值 }

  • 或者数组的全副元素

    for (var n in numbers) {console.log(x); }

然而，JavaScript 自作聪明的“一心两用”却给咱们带来一个意外惊喜：

numbers.name = ‘Hello’; // 数组依然是一个对象，对象就能够这样动静增加属性

而后再迭代（循环）numbers，后果是什么？Hello 也被输入来了，^_^

@想一想 @：JavaScript 是把数组中的元素当成了属性么？如何证实呢？所以，ES6 又引入了 for…of… 循环，用于数组时就只会取到数组元素，而不会取得数组属性。

for (var i of students) {console.log(i[0]); }

再看数组

var arr = [2, -1, ’33’, true, ‘78.5’, null, 5, 2, ”, 7, 9];

  • find/findIndex：

    arr.findIndex(function (v) {return !isNaN(v) && (v + ”).indexOf(‘.’) > -1; })

  • filter：过滤掉不符合条件的元素

    arr.filter(function (v, index, arr) {return index % 2 === 0 && v > 0;});

  • every：查看数组里每个元素是否合乎规定

    arr.every(function (v, index, arr) {return !isNaN(v); })

  • map：对数组元素顺次进行运算

    arr.map(function (v) {return v + 10;})

  • reduce：重叠运算，每一次运算返回的值作为 previous

    arr.reduce(function (prev, value) {//return prev + value; //return parseFloat(prev) + parseFloat(value); return (+prev) + (+value); })

留神：都是将 function 作为参数传递！

选择器：selector

  • querySelector()：返回第一个 Element（null）
  • querySelectorAll()：返回所有复合条件的 NodeList（empty），留神：not live

罕用条件（类 CSS）：

  • 标签：div，p，a……
  • Id：#id
  • class：.class

  • 属性：[attribute=]

    a[href]{}

    还能够应用：

    1. [[attribute=value]](https://www.w3school.com.cn/c… “CSS [attribute=value] 选择器 ”) 用于选取带有指定属性和值的元素。
    2. [[attribute~=value]](https://www.w3school.com.cn/c… “CSS [attribute~=value] 选择器 ”) 用于选取属性值中蕴含指定词汇的元素。
    3. [[attribute|=value]](https://www.w3school.com.cn/c… “CSS [attribute|=value] 选择器 ”) 用于选取带有以指定值结尾的属性值的元素，该值必须是整个单词。
    4. [[attribute^=value]](https://www.w3school.com.cn/c… “CSS [attribute^=value] 选择器 ”) 匹配属性值以指定值结尾的每个元素。
    5. [[attribute$=value]](https://www.w3school.com.cn/cssref/selector_attr_end.asp “CSS [attribute$=value] 选择器 ”) 匹配属性值以指定值结尾的每个元素。
    6. [[attribute=value]](https://www.w3school.com.cn/c… “CSS [attribute=value] 选择器 ”) 匹配属性值中蕴含指定值的每个元素。
  • 混合：类的间接合并，空格（）- 后辈，逗号（,）或者，大于（>）- 子，
  • 兄弟：
  • 加号（+）相邻
  • 波浪线（~）所有

退出混同代码，并演示：

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2020-12-27
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