JavaScript 数组映射,从新整理

数组映射 ,从新整理,配合return,返回一个新数组，没有return，至关于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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