The arguments object thats automatically available within functions can be a source of confusion for some people; it's kind of an array but it's kinda not. JavaScript is awesome in that you can pass any number of arguments to a function, and oftentimes developers need to iterate over every argument provided. The arguments object doesn't have a forEach method, but using a quick JavaScript technique, you can convert arguments to an array:
arguments自动可用的arguments对象可能会使某些人感到困惑。 它有点像数组，但不是。 JavaScript很棒，因为您可以将任意数量的arguments传递给函数，并且开发人员通常需要遍历所提供的每个参数。 arguments对象没有forEach方法，但是使用快速JavaScript技术，您可以将arguments转换为数组：
function myFn(/* any number of arguments */) { var args = Array.prototype.slice.call(arguments); // or [].slice.call(arguments) args.forEach(function(arg) { // do something with args here }); }Much like converting a NodeList to an array, Array's slice method takes the arguments object and converts it to a true array, allowing for forEach, map, and traditional array iteration. Keep that trick up your sleeve for future development.
就像将NodeList转换为数组一样 ，Array的slice方法采用arguments对象并将其转换为真实数组，从而允许forEach，map和传统数组迭代。 继续为将来的发展而忙。
翻译自: https://davidwalsh.name/arguments-array
