js中apply方法的使用详细解析_javascript技巧

Object.extend = function(destination, source) {
    for (property in source) {
        destination[property] = source[property];
    }
    return destination;
}

<script> <BR>function Person(name,age){ //定义一个类，人类 <BR> this.name=name; //名字 <BR> this.age=age; //年龄 <BR> this.sayhello=function(){alert("hello")};<BR>} <BR>function Print(){ //显示类的属性 <BR> this.funcName="Print"; <BR> this.show=function(){ <BR> var msg=[];<BR> for(var key in this){ <BR> if(typeof(this[key])!="function"){<BR> msg.push([key,":",this[key]].join(""));<BR> }<BR> } <BR> alert(msg.join(" "));<BR> };<BR>} <BR>function Student(name,age,grade,school){ //学生类 <BR> Person.apply(this,arguments);<BR> Print.apply(this,arguments);<BR> this.grade=grade; //年级 <BR> this.school=school; //学校 <BR>} <BR>var p1=new Person("jake",10);<BR>p1.sayhello();<BR>var s1=new Student("tom",13,6,"清华小学");<BR>s1.show();<BR>s1.sayhello();<BR>alert(s1.funcName);<BR></script>

var arr=[5,7,9,1]
alert(Math.max(arr))    // 这样却是不行的。一定要这样写

function getMax(arr){
    var arrLen=arr.length;
    for(var i=0,ret=arr[0];i        ret=Math.max(ret,arr[i]);      
    }
    return ret;
}

function getMax2(arr){
    return Math.max.apply(null,arr);
}

var arrLen=arr2.length
for(var i=0;i    arr1.push(arr2[i]);
}