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函数的返回值
* 创建一个函数,用来计算三个数的和。
* 可以使用 return 来设置函数返回值
语法:
return 值
* return 后的值将会作为函数的执行结果返回,可以定义一个变量,来接收该结果。 function sum(a, b, c){ var d = a
+ b + c; return d; } var result = sum(78,87,2);
* 调用函数。
* 变量 result 的值就是函数的执行结果。
* 函数返回什么, result 的值就是什么。
* 在函数中 return 后的语句都不会执行。 function sum(a, b, c){ var d = a + b + c; return
d; console.log("hello"); } var result = sum(78,87,2); console.log(result);
* 如果 return 语句后不跟任何值,就相当于返回一个 undefined 。 function sum(a, b, c){ var d = a +
b + c; return; } var result = sum(78,87,2); console.log(result);
* 如果函数中不写 return ,则也会返回 undefined 。 function sum(a, b, c){ var d = a + b +
c; } var result = sum(78,87,2); console.log(result);
* return 后可以跟任意类型的值。 function sum(a, b, c){ var d = a + b + c; return
"hello"; } var result = sum(78,87,2); console.log(result);
* return 后跟对象。 function fun(){ var obj = { name:"时光" } return obj; } var a =
fun(); console.log("a=" + a); console.log("a=" + a.name);
* return 后跟函数。 function fun2(){ function fun3(){ alert("我是fun3") } return
fun3(); } fun2();