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一些ES6的小技巧
source link: https://juejin.im/post/5ac37eb95188255c61633336
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EcmaScript 2015 (ES6) 已经出现了很多年了，我们可以使用它的一些新特性。 1.设置必须的函数参数 ES6 提供了 默认的参数值，可以让你在函数的参数中指定默认值当参数没有传递其值的时候。 const required = () =>
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