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求大佬点拨下，不明白~

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玩转ACE

#1 Created at ... [Delete] [Delete and Lock User]

老师最后一题改成这样：arr.map(function(x){return parseInt(x)});

输出结果就正确了。为什么直接把`parseInt`函数作为参数时即`arr.map(parseInt);`就会失败呢？请教下原理是什么？

云胡

#2 Created at ... [Delete] [Delete and Lock User]

直接用第二个参数是数组索引，在函数中使用第二个参数默认为 10

李羽安

#3 Created at ... [Delete] [Delete and Lock User]

https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array/map#%E4%BD%BF%E7%94%A8%E6%8A%80%E5%B7%A7%E6%A1%88%E4%BE%8B

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