javaScript數(shù)組：有序，可擴容讨阻，可縮容偎蘸，存儲類型不要求一致。數(shù)組中可同時存儲不同類型的數(shù)據(jù)奄侠。

//創(chuàng)建數(shù)組的三種方法
        //1.常規(guī)方式
        var myAry = new Array();
        myAry[0] = "hello";
        myAry[1] = "good";
        myAry[2] = "morning";
        console.log("myAry:"+myAry.length);
        //2.簡潔方式
        var myAry02 = new Array("a","b","c");
        console.log("myAry02:"+myAry02.length);
        //3.字面方式
        var myAry03 = ["console","write","alert"];
        console.log(myAry03.length);

//數(shù)組中存儲不同類型的數(shù)據(jù)
        var type = [123,"hello",3.14,true,undefined,NaN,null];
        //獲取數(shù)組的長度,正確結(jié)果為7
        console.log(type.length);

//彈棧卓箫，壓棧，擴容垄潮，縮容
        //壓棧烹卒，添加元素
        myAry03.push(document);
        console.log(myAry03.length);
        //彈棧，移除元素
        var temp = myAry03.pop();
        console.log(temp);
        console.log(myAry03.length);
        //擴容弯洗，通過規(guī)定長度直接擴容
        myAry03.length= 10;
        console.log(myAry03[6]);
        //縮容
        myAry03.length= 3;
        console.log(myAry03.length);

/彈棧旅急，壓棧，擴容牡整，縮容
        //壓棧藐吮，添加元素
        myAry03.push(document);
        console.log(myAry03.length);
        //彈棧，移除元素
        var temp = myAry03.pop();
        console.log(temp);
        console.log(myAry03.length);
        //擴容，通過規(guī)定長度直接擴容
        myAry03.length= 10;
        console.log(myAry03[6]);
        //縮容
        myAry03.length= 3;
        console.log(myAry03.length);

        //三種遍歷方式
        //1.普通for
        for(var i=0;i<myAry03.length;i++){
            console.log(i+":"+myAry03[i]);
        }
        for(var i=0;i<10;i++){
            console.log(i+":"+myAry03[i]);
        }
        //2.for in
        for(var i in myAry03){
            console.log(i+":"+myAry03[i]);
        }
        //3.forEach
        myAry03.forEach(function(ele,idx){
            console.log(idx+":"+ele);
        });

        //創(chuàng)建空數(shù)組
        var arrays = [];
        //常量元素
        var a = 100;
        //添加進arrays
        arrays.push(a);
        //字符串元素
        var b = "100";
        //添加進arrays
        arrays.push(b);
        //boolean元素
        var c = true;
        //添加進arrays
        arrays.push(c);
        //字符串元素
        var d = "hello";
        //添加進arrays
        arrays.push(d);
        //數(shù)組元素
        var arr = [1,2];
        //添加進arrays
        arrays.push(arr);
        //函數(shù)元素
        var fun = function(){} ;
        //添加進arrays
        arrays.push(fun);
        //對象元素
        var obj = {};
        //添加進arrays
        arrays.push(obj);
        //未定義元素
        var un = undefined;
        //添加進arrays
        arrays.push(un);
        //NaN元素
        var na = NaN;
        //添加進arrays
        arrays.push(na);
        //遍歷谣辞，判斷類型
        for(var i in arrays){
            console.log(arrays[i]+"--"+typeof arrays[i]);
        }
        /*
        100--number
         100--string
         true--boolean
         hello--string
         1,2--object
         function(){}--function
         [object Object]--object
         undefined--undefined
         NaN--number
         */