JavaScript函数调用的四种模式详解

var blogInfo={
　　blogId:123,
　　blogName:"werwr",
　　showBlog:function(){alert(this.blogId);}
};

blogInfo.showBlog();

var myfunc = function(a,b){
　　return a+b;
}

alert(myfunc(3,4));

var myfunc = function(a){
　　this.a = a;
};
myfunc.prototype = {
　　show:function(){alert(this.a);}
}

var newfunc = new myfunc("123123123");
newfunc.show();

var myobject={};
var sum = function(a,b){
　　return a+b;
};
var sum2 = sum.call(myobject,10,30); //var sum2 = sum.apply(myobject,[10,30]); 
alert(sum2);