javascript中call,apply,bind的区别详解

var xw = {
     name : "小王",
     gender : "男",
     age : 24,
     say : function() {
       alert(this.name + " , " + this.gender + " ,今年" + this.age);                
        }
     }
     var xh = {
       name : "小红",
       gender : "女",
       age : 18
       }
     xw.say();

xw.say.call(xh);

xw.say.apply(xh);

xw.say.bind(xh)();

        var xw = {
            name : "小王",
            gender : "男",
            age : 24,
            say : function(school,grade) {
                alert(this.name + " , " + this.gender + " ,今年" + this.age + " ,在" + school + "上" + grade);                
            }
        }
        var xh = {
            name : "小红",
            gender : "女",
            age : 18
        }

xw.say.call(xh,"实验小学","六年级");    

xw.say.apply(xh,["实验小学","六年级"]);

xw.say.bind(xh,"实验小学","六年级")();

xw.say.bind(xh)("实验小学","六年级");