javaScript中值传递和引用传递

女爷i 2022-11-14 14:44 233阅读 0赞

**案例1**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N6aDUwMA_size_16_color_FFFFFF_t_70][]

var str1 = "江西赣州于都县";
    var number1 = 526.97;
    var b = true;
    var roles = ["建宁公主", "双儿", "曾柔", "沐剑屏", "阿珂", "方怡", "苏荃"];
    var superStar = {name : "黄晓明", age : 43, wife : "Angelababy"};
    
    console.log("*1*", str1, number1, b, roles, superStar);
    
    //值传递和引用传递
    function fun1(parm1, parm2, parm3, parm4, parm5){
    	console.log("*2*", parm1, parm2, parm3, parm4, parm5);
    	parm1 = "我家乡在江西于都县"; //基本类型的数据是传值
    	parm2 = 89.74; //基本类型的数据是传值
    	parm3 = false; //基本类型的数据是传值
    	parm4[0] = "韦小宝"; //引用类型的数据是传引用
    	parm5.age = 44; //引用类型的数据是传引用
    	//引用传递会影响原来的变量
    	console.log("*3*", parm1, parm2, parm3, parm4, parm5);
    	console.log("*4*", str1, number1, b, roles, superStar);
    }
    
    fun1(str1, number1, b, roles, superStar);
    //引用传递会影响原来的变量，roles和superStar会受到影响
    console.log("*5*", str1, number1, b, roles, superStar);

**运行结果如下：**

![20210330010528397.png][]

**案例2**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N6aDUwMA_size_16_color_FFFFFF_t_70 1][]

var str2 = "赣南脐橙";
    var number2 = 246.58;
    var b2 = true;
    var roles2 = ["张无忌", "杨过", "段誉", "乔峰"];
    var superStar2 = {name : "周杰伦", age : 39, wife : "昆凌"};
    
    console.log("*6*", str2, number2, b2, roles2, superStar2);
    
    //值传递和引用传递
    function fun2(parm1, parm2, parm3, parm4, parm5){
    	console.log("*7*", arguments[0], arguments[1], arguments[2], arguments[3], arguments[4]);
    	//这里使用了arguments对象，效果和上一个案例的效果一样
    	arguments[0] = "柿子饼"; //基本类型的数据是传值
    	arguments[1] = 187.63; //基本类型的数据是传值
    	arguments[2] = false; //基本类型的数据是传值
    	arguments[3][0] = "令狐冲"; //引用类型的数据是传引用
    	arguments[4].age = 37; //引用类型的数据是传引用
    	//引用传递会影响原来的变量
    	console.log("*8*", parm1, parm2, parm3, parm4, parm5);
    	console.log("*9*", str2, number2, b2, roles2, superStar2);
    }
    
    fun2(str2, number2, b2, roles2, superStar2);
    //引用传递会影响原来的变量，roles2和superStar2会受到影响
    console.log("*10*", str2, number2, b2, roles2, superStar2);

**运行结果如下：**

![20210330011003880.png][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N6aDUwMA_size_16_color_FFFFFF_t_70]: /images/20221022/c33b6a964ce84d3bbdb0f2595436590c.png
[20210330010528397.png]: /images/20221022/4dd057a15bdb4d66989dca5b8a04dfd3.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N6aDUwMA_size_16_color_FFFFFF_t_70 1]: /images/20221022/e0ef543b49dc465ab0e50a3e748fec9e.png
[20210330011003880.png]: /images/20221022/a7be19065f9b43acbb19077d27ed79c7.png