求js面试题答案第二题：请说明要输出正确的myName的值要如何修改程序?foo=function(){this.myName="Foofunction.";}foo.prototype.sayHello=function(){alert(this.myName);}foo.prototype.bar=function(){setTimeout(this.sayHel

Question

求js面试题答案
第二题：请说明要输出正确的myName的值要如何修改程序?
foo = function(){
this.myName = "Foo function.";
}
foo.prototype.sayHello = function(){
alert(this.myName);
}
foo.prototype.bar = function(){
setTimeout(this.sayHello,1000);
}
var f = new foo;
f.bar();

Answer 1

foo = function(){
this.myName = "Foo function.";
}
foo.prototype.sayHello = function(){
alert(this.myName);
}
foo.prototype.bar = function(){
setTimeout(
(function(s){
return function(){
s.sayHello()
}
})(this),1000);
}
var f = new foo;
f.bar();