q1:Extends是干嘛的??
q2:
//test
function ArgTest(a, b){
var i, s = "The ArgTest function expected ";
var numargs = arguments.length; // 获取被传递参数的数值。
var expargs = ArgTest.length; // 获取期望参数的数值。
if (expargs < 2)
s += expargs + " argument. ";
else
s += expargs + " arguments. ";
if (numargs < 2)
s += numargs + " was passed.";
else
s += numargs + " were passed.";
s += "\n\n"
for (i =0 ; i < numargs; i++){ // 获取参数内容。
s += " Arg " + i + " = " + arguments[i] + "\n";
}
return(s); // 返回参数列表。
}
alert(ArgTest(3, 14));
====================
arg:a
arg:b
====================
jquery
$("<option>",{
value: this.value,
text: this.text,
selected: this.value==val ? true : false
}) //属性添加方式
function ClassA()
{
this.a='a';
}
function ClassB()
{
this.b='b';
}
ClassB.prototype=new ClassA();
var objB=new ClassB();
var info="";
for(var p in objB) info += p+" ";
alert(info);
====================
a b
===================
function ClassA()
{
this.a='a';
}
function ClassB()
{
this.b='b';
}
ClassB.prototype=new ClassA();
var objB=new ClassB();
alert(objB.a);
ClassB.prototype.a='changed!!';
alert(objB.a);
==============
a->changed
===================
function ClassA()
{
this.a=function(){alert();};
}
function ClassB()
{
this.b=function(){alert();};
}
ClassB.prototype=new ClassA();
var objB1=new ClassB();
var objB2=new ClassB();
alert(objB1.a==objB2.a);
alert(objB1.b==objB2.b);
===================
true
false
=====================
function ClassA()
{
alert("a");
this.a=function(){alert();};
}
function ClassB()
{
alert("b");
this.b=function(){alert();};
}
ClassB.prototype=new ClassA();
var objB1=new ClassB();
var objB2=new ClassB();
===================
a
b
b
=====================
function ClassA()
{
this.a=[];
}
function ClassB()
{
this.b=function(){alert();};
}
ClassB.prototype=new ClassA();
var objB1=new ClassB();
var objB2=new ClassB();
objB1.a.push(1,2,3);
alert(objB2.a);//改1变2
===================
1,2,3
=====================
function A() {
this.t1 = "ffffff";
this.t2 = function (msg) {
alert(msg);
};
};
A.prototype.p1 = "xxxx";
A.prototype.f1 = function () {
alert(this.p1);
};
var testtest=new A();
testtest.t2("哇哈哈");
testtest.f1();
===================
哇哈哈 xxxx
=====================
function AA(val1,val2) {
this.test1 = function() {
alert(val1);
};
this.test2 = val2 ? function () { return this.test1;} : function () { return 456; };
this.test3 = val1 ? val1 : function () {alert("no val1");};
}
var t123=new AA(1,0);
t123.test1();
t123.test2();
t123.test3;//变量与函数并列,如果传回类型不同,会报错 找不到函数
==============
1
==================
function MyObject(name, size)
{
this.name = name;
this.size = size;
}
MyObject.prototype.color = "red";
MyObject.prototype.tellSize = function()
{
return "size of "+this.name+" is "+this.size;
}
MyObject.prototype.tellColor = function()
{
return "color of "+this.name+" is "+this.color;
}
var test1= new MyObject("123","10");
var test2= new MyObject("234","20");
test1.color = "white";
alert(test1.tellSize()+"\t"+test2.tellSize()+"\n"+test1.tellColor()+"\t"+test2.tellColor()+"\n"+test2.tellColor);
==================
o1 = function(){alert("o1");};
o2 = function(){alert("o2");};
o2.prototype = new o1;
var t11= new o2;
==============
function People(name)
{
this.name=name;
//对象方法
this.Introduce=function(){
alert("My name is "+this.name);
}
}
//类方法
People.Run=function(){
alert("I can run");
}
//原型方法
People.prototype.IntroduceChinese=function(){
alert(" 我的名字是"+this.name);
}
var p1=new People("Windking");
p1.Introduce();
People.Run();
p1.IntroduceChinese();
===================
function a(){
var i=0;
function b(){
alert(++i);
}
return b;
}
var c=a();
c();
c();
===========
1,2
===============
var sURL = "http://oreilly.com/this_is_a_value&some-value='some value'";
sURL = encodeURI(sURL);
alert("<p>" + sURL + "</p>");
转换URL decodeURI转成正常字符
encodeURIComponent和decodeURIComponent,它们也能编码&、+和=,所以可以用于Ajax操作。
=================
alert(test123==null);
var test123;
alert(test123==undefined);
============
true
true
================
var test123=new Array(1,2,3);
for(var a in test123){
alert(a);
}
0,1,2
===============
var sTemp = "test string";
alert ((typeof sTemp)+ " "+(typeof 86)+ " "+(typeof null)+ " "+(typeof undefined)+ " "+(typeof true)); //typeof null==object...
==================
switch($("#input").val()){//switch可以用字符串
case "0":
alert("123");
break;
}
==============================
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