各种创建数组的方法

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var arr = Object.keys(Array.apply(null, {length:100}))
　　console.log(arr);

var arr = Object.keys(Array.apply(null, {length:100})).map(function(item){
        return +item;
    });
    console.log(arr);

var arr = Array.from({length:100}, (v,k) => k);
    console.log(arr);

var arr = new Array(100).keys();
   console.log(Array.from(arr));

var arr = Object.keys(Array.from({length:100}));
   console.log(arr);

var arr = Object.keys(Array.from({length:100})).map(function(item){
        return +item;
    });
    console.log(arr);

var arr = [...Array(100).keys()];
console.log(arr);

var arr = [...Array.from({length:100}).keys()];
console.log(arr);

var arr = Object.keys(String(Array(101)));
console.log(arr);

var arr = Object.keys(String(Array(100))).map(function(item){
    return +item;
});
console.log(arr);

var arr = Object.keys(new Int8Array(100)).map(function(item){
    return +item;
});
console.log(arr);

var arr = [];
    var i = 0;
    var timer = setInterval(function(){
        arr[i] = i++;
        if(i>=100){
            clearInterval(timer);
            console.log(arr);
        }
    },1);

var arr = [];
    var i = 0;
    function MakeArray(num){
        if(i<num){
            arr[i] = i++;
            MakeArray(num);
        }
        return arr;
    }
    console.log(MakeArray(100));

var arr = new Array(100).toString().split(',').map(function(item,index){
        return index;
    });
    console.log(arr);

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