JavaScript 數組映射,從新整理

數組映射 ,從新整理,配合return,返回一個新數組，沒有return，至關於forEach()javascript arr.map(val,index,arr) java let arr = [ {title:'name',age:'10'}, {title:'aaa',age:'10'}, {title:'aaa',age:'10'}, {title:'aaa

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