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                1.# 把數組中每個元素的某個字段取出 ``` 方法:map() let cities = [   {city:"北京",bOn:false},   {city:"上海",bOn:false},   {city:"重慶",bOn:false},   {city:"廣州",bOn:false},   {city:"西安",bOn:false} ];  let city = cities.map((item) =>{    return item.city  }); ``` 2.# 根據id取出數組中的對象 ``` var arr=[ {id: 1,name: 'a'}, {id: 2,name: 'b'}, ] var obj=arr.find(function (x) { return x.id === 1 }) ``` 3.# 去除對象中的空鍵值對 ``` var data={a:1,b:2,c:3,4:''} for ( var key in data ){ if ( data[key] === '' ){ delete data[key] } } ```
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