es6 filter方法的使用

		var obj = [
			{
				id:1,
				name:'张三',
				beizhu:'123asd'
			},
			{
				id:2,
				name:'李四',
				beizhu:'122fghasd'
			},
			{
				id:3,
				name:'王五',
				beizhu:'12df4sd'
			},
		]
		//取出数组对应的值
		console.log(obj.filter(item =>(item.id==1)))		
		//{id: 1, name: "张三", beizhu: "123asd"}

		//过滤数组中undefined，null，空字符串
		var arr1 = [1,'',undefined,null,'aaa']
		 console.log(arr1.filter(item=>(item)))	
		 //[1, "aaa"]

		//去除数组中不符合的值
		var arr2 = [2,40,5,100,8,90]
		console.log(arr2.filter(item=>(item>40)))		
		//[100, 90]
		
		//去掉数组中不符合项
		var arr3= [22,40,5,200,8,90]
		console.log(arr3.filter(item=> item.toString().indexOf(2)<0))   
		//[40, 5, 8, 90]
		
		// //数组去重
		var arr4 = [11,22,33,44,44,22,55]
		console.log(arr4.filter((num,index,list)=>list.indexOf(num) == index))   
		// [11, 22, 33, 44, 55]

本文地址：https://blog.csdn.net/weixin_40808668/article/details/109643324