Question

嘿，基本上我想知道是否可以将对象的属性作为切换案例中的条件。这样的事情。

function Person (age,name){
this.age = age
this.name = name
 }

var person1 = new Person(22,"Ken")
var person2 = new Person(42,"Ben")
var person3 = new Person(62,"Len")


switch(the attribute here lets say it was age for example){


case person1: Do something;    Basically age for person1 do this age for person 2 do this etc.
break;
case person2: Do something;
break;
case person3: Do something;
break;
}

很抱歉，如果不清楚我是javascript的新手，我想知道这种事情是可能的。

Answer 1

我认为你要做的是：

function Person (age,name){
    this.age = age;
    this.name = name;
}

 var person1 = new Person(22,"Ken");
 var person2 = new Person(42,"Ben");
 var person3 = new Person(62,"Len");
 switch(person.age){
     case 22:
        alert("the person is " + person.name);
        break;
     case 42:
        //do something here;
        break;
     default:
        //do something default;
        break;
 }

你确定可以将一个对象的属性放入switch / case条件中，因为它就像其他变量一样，为什么不呢。

Answer 2

尝试：

switch(this.age){
  case x:
}

this表示父对象。所以如果我说this.age它代表父对象的年龄，而不需要指定年龄。

Answer 3

另外，你可以这样做：

function Person(age, name) {
  this.age = age;
  this.name = name;
}

var person1 = new Person(22, "Ken");
var person2 = new Person(42, "Ben");
var person3 = new Person(62, "Len");

var person, people = [person1, person2, person3];
while (p = people.shift()) {
  console.log("Q: Do you think " + p.name + " is old?");
  console.log("A: " + isOld(p));
}

function isOld(person) {
  switch(true) {
    case person.age < 40:
      return "Not at all.";
    case person.age < 60:
      return "I prefer not to comment.";
    default:
      return "Who? The grandpa?";
  }
}

关于switch case的快速javascript帮助

3 个答案: