ES6 map方法與filter方法
阿新 • • 發佈:2019-01-02
map 方法:可以簡單的理解為對映
var num = [1,2,3,4];
var dataAdd = num.map(n => n+n);
var datadeep = num.map(n => n-1);
console.log(dataAdd);//[2, 4, 6, 8]
console.log(datadeep);//[0,1,2,3]
filter方法: 過濾篩選的作用,陣列filter後,返回的結果為新的陣列
var chinaWords = [{ name:"君住長江頭", msg:"詩詞", age:15 },{ name:"我住長江尾", msg:"歌賦", age:15 },{ name:"日日思君不見君,同飲一江水", msg:"古風", age:14 }] var dataname = chinaWords.map(one => one.name) console.log(dataname.join(','));//君住長江頭,我住長江尾,日日思君不見君,同飲一江水 var oneages = chinaWords.map(one => one.age) console.log(oneages.join(','));//15,15,14 var ageJudge = oneages.filter(age => age > 14 ) console.log(ageJudge.join(','));//15,15