var Dog=function(){
  this.name="汪星人";
  this.shout=function(){
  alert(this.name);
  }
};
var Cat=function(){
  this.name="喵星人";
  this.shout=function(){
  alert(this.name);
  }
};
var dog=new Dog();
var cat=new Cat();
dog.shout();
cat.shout();

var Dog=function(){
  this.name="汪星人";
  this.shout=function(){
  alert(this.name);
  }
};
var Cat=function(){
  this.name="喵星人";
};
var dog=new Dog();
var cat=new Cat();
dog.shout();
dog.shout.call(cat);
cat.shout();

var xh=
{
  name:"小红",
  job:"前端工程师"
};
var xm=
{
  name:"小明",
  job:"js工程师"
};
var xw=
{
  name:"小王",
  job:"html5工程师"
};
function myjob(gender,age,company)
{
  alert(this.name+","+gender+",今年"+age+"岁,在"+company+"担任"+this.job);
}
myjob.call(xh,"女",24,"腾讯");
myjob.call(xm,"男",22,"新浪");
myjob.call(xw,"男",28,"网易");

var xh=
{
  name:"小红",
  job:"前端工程师"
};
var xm=
{
  name:"小明",
  job:"js工程师"
};
var xw=
{
  name:"小王",
  job:"html5工程师"
};
function myjob(gender,age,company)
{
  alert(this.name+","+gender+",今年"+age+"岁,在"+company+"担任"+this.job);
}
myjob.apply(xh,["女",24,"腾讯"]);
myjob.apply(xm,["男",22,"新浪"]);
myjob.apply(xw,["男",28,"网易"]);

xw.say.call(xh);     //对函数直接调用
xw.say.apply(xh);   //对函数直接调用
xw.say.bind(xh)();   //返回的仍然是一个函数，因此后面需要()来调用

xw.say.bind(xh,"中央大学","一年级")();

xw.say.bind(xh)("中央大学","一年级");