1.案例一:取给定数组的某一字段组成新数组
的后台传来的数据 data(json):
[ //data的数据 {"txt":"09:00-12:00","codId":"1","flgDel":"0","id":1}, {"txt":"13:00-16:00","codId":"1","flgDel":"0","id":2}, {"txt":"18:00-20:00","codId":"1","flgDel":"0","id":3} ]
前台使用要为:
['09:00-12:00', '13:00-16:00', '18:00-20:00']
用到map()只需一行(想要用到for循环遍历出来)很麻烦。
let time = data.map(item =>(item.txt)) console.log(time) //控制台输出如下 //['09:00-12:00', '13:00-16:00', '18:00-20:00']
2.案例二:取给定数组的某些字段重命名并组成新数组
新的接口传来data(json):
[ //新data数据 {"txt":"拜访","flgDel":"0","id":1}, {"txt":"面试","flgDel":"0","id":2}, {"txt":"其他","flgDel":"0","id":3} ]
前台使用数组结构:
[{ name: '拜访' }, { name: '面试' }, { name: '其他' }] //这里看到相比于案例一有字段了,还新命名了
//只需一行map() let resion = data.map(item =>({name: item.txt})) console.log(resion) //控制台输出 //[{ name: '拜访' }, { name: '面试' }, { name: '其他' }]
当然,或许你要的这样⬇ :
[{ name: '拜访',id:'1' }, { name: '面试',id:'2' }, { name: '其他',id:'3'}] //要两个字段的数据
let resion2 = data.map(item =>({name: item.txt, id: item.id})) console.log(resion2) //控制台输出 //[{ name: '拜访',id:'1' }, { name: '面试',id:'2' }, { name: '其他',id:'3'}]
又或许想要这样⬇ :
[{ name: '拜访1' }, { name: '面试2' }, { name: '其他3'}] //要拼接的数据
let resion3 = data.map(item =>({name: item.txt + item.id})) console.log(resion3) //控制台输出 //[{ name: '拜访1' }, { name: '面试2' }, { name: '其他3'}]