es6判断数组已存在某个对象。
find()
方法返回数组中满足提供的测试函数的第一个元素的值。否则返回undefined
。findIndex()
方法返回数组中满足提供的测试函数的第一个元素的索引。否则返回-1。
find方法:
var objArr = [{id:1, name:'jiankian'}, {id:23, name:'anan'}, {id:188, name:'superme'}, {id:233, name:'jobs'}, {id:288, name:'bill', age:89}, {id:333}] ; var ret2 = objArr.find((v) => { return v.id == 233; }); console.log(ret2); // return {id:233, name:'jobs'} // 当返回undefined时,则说明objArr中没有,可以添加
findIndex方法:
var objArr = [{id:1, name:'jiankian'}, {id:23, name:'anan'}, {id:188, name:'superme'}, {id:233, name:'jobs'}, {id:288, name:'bill', age:89}, {id:333}] ; var ret2 = objArr.findIndex((v) => { return v.id == 233; }); console.log(ret2); // return 3 // 当返回-1时,则说明objArr中没有,可以添加了