jsは1-100の数を配列に預け入れます.

2324 ワード






          
        //     :    
        var arr1 = new Array(100);
        for(var i=0;i<arr1.length;i++){
            arr1[i] = i;
        }
        console.log(arr1);
          
        
        //     :push    
        var arr2 = new Array();
        for(var i=0;i<100;i++){
            arr2.push(i);
        }
        console.log(arr2);
        
        
        
        //     :while
        var arr3 = new Array();
        var i = 0;
        while(i<100){
            arr3.push(i);
            i++;
        }
        console.log(arr3);
        
        
        
        //     :do while
        var arr4 = new Array();
        var i = 0;
        do{
            arr4.push(i);
            i++;
        }
        while(i<100)
        console.log(arr4);
        
        
        //     :
        var arr5 = Object.keys(Array.apply(null, {length:100})).map(function(item){
                
                return +item;
                
        });
        console.log(arr5);
        
        
        //     :
        var arr6 = Array.from({length:100}, (v,k) => k);
        console.log(arr6);
        
        
        //     :
        var arr7 = Array.from(Array(100), (v,k) =>k);
        console.log(arr7);

        
        //     :
        var arr8 = new Array(100).keys();
        console.log(Array.from(arr8));
        
        
        //     :
        var arr9 = [];
        var i = 0;
        var timer = setInterval(function(){
            arr9[i] = i++;
            if(i>=100){
                clearInterval(timer);
                console.log(arr9);
            }
        },1);
        
        
        //     :
        var arr = [];
        var i = 0;
        function MakeArray(num){
            if(i<num){
                arr[i] = i++;
                MakeArray(num);
            }
            return arr;
        }
        console.log(MakeArray(100));
        
        
        //      :
        var arr11 = new Array(100).toString().split(',').map(function(item,index){
            return index;
        });
        console.log(arr11);
        
        

javascript typeof