ES6中filter过滤器的⽤法
var sexData=["男","⼥","⼥","男","⼥"];
var filter2=sexData.filter(function(sex){
return sex==="⼥"
})
//console.log(filter2)    ["⼥", "⼥", "⼥"]
var porducts =[
{name:'apple',type:'red'},
{name:'orange',type:'orange'},
{name:'banana',type:'yellow'},
{name:'mango',type:'yellow'}
]
;
var filter2=porducts.filter(function(item){
pe==='yellow'
})
//console.log(filter2)
//0: {name: "banana", type: "yellow"}1: {name: "mango", type: "yellow"}
1. filter()
返回符合条件的元素的数组[]
筛选回调函数，有三个参数
语法：
array.filter((value, index, arr) => {value === '匹配对象'})
特殊⽤法：
1. 去掉空字符串、undefined、null
array.filter((value, index, arr) => {value})
2. 数组去重
array.filter((value, index, arr) => {arr.indexOf(value) === index})
//1. 去掉空字符串、undefined、null
var porducts =[
{name:''},
{name:"哈哈"}
];
var filter2=porducts.filter(function(item){
return item.name
})
//console.log(filter2)
//打印得出  0: {name: "哈哈"}
//2. 数组去重
array.filter((value, index, arr)=>{arr.indexOf(value)=== index})
var porducts =['苹果','⾹蕉','苹果','芒果']
filter过滤对象数组
var filter2=porducts.filter(function(item,index,porducts){
return porducts.indexOf(item)==index
})
//console.log(filter2)
/
/ ["苹果", "⾹蕉", "芒果"]

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