打乱数组顺序

        function shuffleD(arr) {
            for(let i = 0,len = arr.length; i < len; i++){
                let j = parseInt(Math.random() * (len - 1));
                [arr[i], arr[j]] = [arr[j], arr[i]];
                console.log(arr);
            }
            console.log(arr)            
            return arr;
        }
　　　　　shuffleD(arr);

   --------------------------------其他的写作形式----仅供参考-------------------------------------------------     

　　　　 function shuffleA(arr) {
            for(let i = arr.length-1;i > -1;i--){
                let j = Math.floor(Math.random() * i);
                [arr[j], arr[i]] = [arr[i], arr[j]];
            }
            console.log(arr)
            return arr;
        }
        function shuffleB(arr) {
            for(let i = 0,len = arr.length; i < len; i++){
                let currentRandom = parseInt(Math.random() * (len - 1));
                let current = arr[i];
                arr[i] = arr[currentRandom];
                arr[currentRandom] = current;
                console.log(arr);
            }
            console.log(arr)            
            return arr;
        }
        function shuffleC(arr) {
            let i = arr.length;
            while (i) {
                let j = Math.floor(Math.random() * i--);
                [arr[j], arr[i]] = [arr[i], arr[j]];
            }
            console.log(arr)            
            return arr;
        }

 

 

转载于:https://www.cnblogs.com/llllpzyy/p/9933762.html