javascript - 如何从键 :function the same way as key:value in JavaScript? 检索值

Question

如何以与检索 foo1.x 相同的方式检索 foo2.x？

var foo1 = {x: 4};
var foo2 = {x: function(){return addOne(foo1.x);}}

function addOne(var1){return (var1 + 1);}

alert(foo1.x);
alert(foo2.x()); // needs parentheses, but argument is never needed

Answer 1

看来你想要一个 getter function :

var foo1 = {x: 4},
    foo2 = {get x() { return foo1.x + 1; }};

foo2.x; // 5
foo1.x = 0;
foo2.x; // 1