javascript中的this
<script type="text/javascript">
  var person = {
  name:"Kevin Yang",
  sayHi:function(){
  alert("你好，我是"+this.name);
  }
  }
  setTimeout(person.sayHi,2000);
</script>

------解决方案--------------------
this 指 调用者的对象

setTimeout(person.sayHi,2000);
换成
person.sayHi();

就能正确了。
------解决方案--------------------
你这里 this 指的是 window 对象
------解决方案--------------------
或者 

<script type="text/javascript">
var person = {
name:"Kevin Yang",
sayHi:function(){
alert("你好，我是"+person .name);
}
}
setTimeout(person.sayHi,2000);
</script>
------解决方案--------------------
楼主没有调用哪个函数，所以没有显示
------解决方案--------------------
<script type="text/javascript">
var person = {
name:"Kevin Yang",
sayHi:function(){
alert("你好，我是"+this.name);
}
}
setTimeout(function(){person.sayHi()},2000);
</script>
------解决方案--------------------

JScript code

  var person = {
  name:"Kevin Yang",
  sayHi:function(){
  alert("你好，我是"+this.name);
  }
  }
  setTimeout("person.sayHi()",10);

------解决方案--------------------
JScript code
  var person = {
  name:"Kevin Yang",
  sayHi:function(){
  alert("你好，我是"+this.name);
  }
  }
  setTimeout("person.sayHi()",10);

------解决方案--------------------
var person={
"SayHello":function(name){
  alert(name);
}
}
调用:
person.SayHello("Test");