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ES 新特性

ES7 stage-3

  • string padding:String.prototype.padStart(maxLength, fillString=' '),String.prototype.padEnd(maxLength, fillString=' ').

  • Trailing commas in function parameter lists and calls.

ES7 stage-4

  • Object.entries() Object.values(): 更方便的遍历 Object（要求 key 必须是 string）