JavaScript连载20-数据存储方式、内置对象Array详解

<script>
    //1.基本数据类型
    var str1 = "xiaoliao";
    var str2 = str1;//基本数据类型是传输的值，引用数据类型传输的是内存地址

    str1 = "itLike";
    console.log(str1);
    console.log(str2);
    console.log("========================");
    //2.复杂类型
    function Person(name,age,intro) {
        this.name = name;
        this.age = age;
        this.intro = intro;
    }

    var p1 = new Person("xiaoming",45,"This is a virtuous person!");
    var p2 = p1;
    p1.name = "daliao";
    console.log(p1.name);
    console.log(p2.name);//可以看出来传输的是内容地址
    console.log("============================");
    //3.基本类型作为函数的参数
    var num1 = 10,num2 = 23;
    //可以看出来函数也是值传递
    fn(num1,num2);
    console.log("num1="+num1);
    console.log("num2="+num2);
    function fn(n1,n2) {
        n1 *= 2;
        n2 /= 2;
        console.log("n1="+n1);
        console.log("n2="+n2);
    }
    console.log("=========================");
    //4.复杂类型作为函数参数
    function Person(name,age,sex) {
        this.name = name;
        this.age = age;
        this.sex = sex;
    }

    function func(person) {
        person.name = "周杰伦";
        
    }

    var  p = new Person("xiaoming",45,"男");
    console.log(p.name)
    func(p);
    console.log(p.name);//可以看出来是地址传递
</script>

    //1.检测一个对象是否是数组
    var arr = ["zhansan","lisi","wangwu"];
    console.log(arr instanceof Array);
    console.log(arr instanceof Object);//这句话可以看出数组也是一种对象
    console.log(arr instanceof Function);//数组不是函数类型
    //另一种方法，成员方法     .isArray()
    console.log(Array.isArray(arr));
    console.log(Array.isArray("arr"));

    //2.数组常用API
    var arr = ["zhangsan","lisi"];
    console.log(arr.toString());
    console.log(arr.valueOf());//返回的是数组本身
    //3.join(sperator)方法，将数组的元素组成一个字符串，以seperator为分隔符，省略的话则默认用逗号为
    //分隔符,该方法只接受一个参数：即分隔符。
    console.log(arr.join("-"));
    console.log(arr.join("^"));
    //4.压栈，出栈
    arr.push("附加的");//返回值就是数组的总长度
    console.log(arr.toString());
    arr.pop();
    console.log(arr.toString());
    console.log("=======================");
    //5.shift()函数，是相当于从头部进行删除
    arr.push("sdohf");
    arr.push("nvl");
    console.log(arr.toString());
    arr.shift();
    console.log(arr.toString());