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                #### 對象擴展方法 ##### Object.fromEntries > 用來創建一個對象,參數是一個二維數組或者Map對象( 將二維數組或者Map對象轉化為對象 ) > > 與[Object.entries](#%E5%AF%B9%E8%B1%A1%E6%96%B9%E6%B3%95%E6%89%A9%E5%B1%95) 為逆運算 #### 字符串擴展方法 ##### trimStart、trimEnd > ES5中有 trim方法用來清除字符串兩邊的空白字符 > > trimStart:清除左側空白字符,保留右側空白字符 > > trimEnd:清除右側空白字符,保留左側空白字符 #### 數組方法擴展 ##### flat、flatMap * flap > flap:拍打、平 > > 將多維數組轉化為低維數組 arr.flat(argus) 參數為深度,3維轉1維深度為2 * flapMap > 如果arr.map()返回的是一個二維數組,可以使用flapMap代替map,返回一維數組 ![image-20200718120616747](http://image.mdashen.com/pic/image-20200718120616747.png) #### Symbol方法擴展 ##### Symbol.prototype.description > 獲取Symbol的字符串描述 ~~~ let s = Symbol('yishen') s.description ? // -> yishen ~~~
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