js函數參數的傳遞方式是值傳遞。
基本類型的值傳遞的是變量的值
引用類型傳遞的是內存地址
實例如下:
var num = 10,
name = "Addy Osmani",
obj1 = {
value: "first value"
},
obj2 = {
value: "second value"
},
obj3 = obj2;
function change(num, name, obj1, obj2) {
num = num * 10;
name = "Paul Irish";
obj1 = obj2;
obj2.value = "new value"; //改變了內存地址指向的變量的屬性值
}
change(num, name, obj1, obj2);
console.log(num); // 10
console.log(name);// "Addy Osmani"
console.log(obj1.value);//"first value"
console.log(obj2.value);//"new value"
console.log(obj3.value);//"new value"