Javascript中数组的使用

//创建一个对象并初始化它
    var preInitArray = new Array("First Item", "Second Item", "Third Item");

    for (var i = 0; i < preInitArray.length; i++) {
        console.log(preInitArray[i]);
    }
    //保存一定数目的数据项
    var preArray = new Array(3);

    //创建一个空的数组，长度未指定
    var anArray = new Array();
    //为元素赋值来为数组添加新的数据项
    anArray[0] = "First Item";
    anArray[1] = "Second Item";
    anArray[2] = "Third Item";

    //数组的简写方式
    var myArray = [1, 2, 3];
    var yourArray = ["Red","White","Blue"];

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var myArray = new Array(20, 40, 50, 10);

    var tempArray = myArray;
    //然后使用sort()方法排序
    tempArray.sort();

    //然后索引输出myArray里面的值，发现myArray也排序了。
    for (var j = 0; j < myArray.length; j++) {
        console.log(j + "：" + myArray[j]);
        //输出结果:
        /*
        0:10
        1:20
        3:50
        */
    }

发现myArray数组也进行了排序，其实Javascript中数组对象都是引用类型的，所以tempArray排序之后，myArray里面的数据也进行了相应的排序。所以得到没有得到自己预期的结果。改动一下代码进行数组间的复制操作。

//完成数组之间的复制操作
    for (var i = 0; i < myArray.length; i++) {
        tempArray[i] = myArray[0];
    }

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