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重学ES6 函数的扩展（上）
source link: https://juejin.im/post/5cb51788e51d456e4514f53a
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函数参数的默认值 基本用法 在ES6之前，我们是这样来做的 function log( x, y){ y = y || 'world' console.log(x, y) } log('hello') //hello world log('h
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