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                1. ES6解決了函數的**默認參數**的問題: ~~~ function(url, timeout = 2000, callback = function() {}) { // do somthing }; ~~~ 2. ES6默認參數不在argument對象之內; ~~~ function(first, second = 'b') { console.log(arguments.length); // 1 console.log(first === arguments[0]); // true console.log(second === arguments[1]) // false }; ~~~ 3.
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