js提取对象数组中的某一个属性组成新数组
例: arrold = [ {name: "name1", age: "1"}, {name: "name2", age: "2"}, {name: "name3", age: "3"}, {name: "name4", age: "4"}, {name: "name5", age: "5"}, {name: "name6", age: "6"} ] arrnew = ["name1","name2","name3","name4","name5","name6"]
方法一:
1 let arr = [] 2 arrold.forEach(e => { 3 arrnew.push(e.name) 4 })
方法二:
1 let arrnew = arrold.map(obj => { 2 return obj.name; 3 })
补充:
1 let arrnew = arrold.map(item => { 2 return Object.assign({},{'name':item.name}) 3 })
关于Object.assign(target,sources)方法:拷贝源对象且可枚举的属性到目标对象,如果目标对象中的属性具有相同的键,则属性将被源中的属性覆盖。例:
1 const object1 = { 2 a: 1, 3 b: 2, 4 c: 3 5 }; 6 7 // object2: a=1, b=2, c=3, d=5 8 const object2 = Object.assign({c: 4, d: 5}, object1);