lovecoding
/
W260426


			
				
					
						
						
							1234567891011121314151617181920212223242526
							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let arr = [1,2,3,4,1,2,3,4,5,3,4,6,7,8,9]
        // 方法一 new Set()
        // let set = new Set(arr);
        // set = Array.from(set);
        // console.log(set);

        // 方法二 include() 方法判断元素是否存在数组
        let newArr = [];
        for(let item of arr){
            if(!newArr.includes(item)){
                newArr.push(item);
            }
        }
        console.log(newArr);
    </script>
</body>
</html>