将数组转换为大写

问题描述

我有一个数组，我想改成大写，但我不能让它工作。请帮我。

I have an array that I want to change to upper case but I can´t make it work. Please help me.

var array2 = ["melon","banana","apple","orange","lemon"];

array2.toUpperCase()

我也试过以下但是它不起作用。

I have also tried the below but it doesn´t work neither.

array2.map(toUpperCase);

提前致谢！

推荐答案

你应该在地图中使用处理函数：

you should use handler function in map:

var array2 = ["melon","banana","apple","orange","lemon"];
array2 = array2.map(function(x){ return x.toUpperCase() })

有关地图的更多信息

编辑：是的，你可以做到

edit: yes you can do

toUpper = function(x){
  return x.toUpperCase();
};
array2 = array2.map(toUpper);

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