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Default export:Default export is easy way to export a function to outside module.//flash-message.jsexport default function(message){ alert(message);... 阅读全文
posted @ 2016-01-14 20:17
Zhentiw
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In constructor, you can call parent's constuctor() method by supert();class ShoppingCart { constructor(userId){ this.userId = userId; this.prod... 阅读全文
posted @ 2016-01-14 20:02
Zhentiw
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Limitations With ArrayArrays don't enforce uniqueness of items. Diplicate entries are allowed.Using Setslet tags = new Set() ;tags.add('Javascript');t... 阅读全文
posted @ 2016-01-14 04:11
Zhentiw
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WeakMap: is a type of Map where only objects can be passed as keys. Primitive data type -- such are string, numbers, booleans, etc --- are not allowed... 阅读全文
posted @ 2016-01-14 04:07
Zhentiw
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Use Maps when keys are unknown until runtime:Map:let recentPosts = new Map();createPost( newPost, (data)=>{ // Key unknown until runtime, so use Ma... 阅读全文
posted @ 2016-01-14 03:35
Zhentiw
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A common problem when dealing with some kinds of data is that not every object has the same nested structure. lukeskywalker.parents.father.isjedi work... 阅读全文
posted @ 2016-01-14 03:19
Zhentiw
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