js学习

 字符串搜索

1: <script language=”JavaScript”>
2: <!--
3: var myVariable = “Hello there”;
4: var therePlace = myVariable.search(“there”);
5: document.write(therePlace);
6: // -->
7: </script>

 

 创建数组

1: <script language=”JavaScript”>
2: <!--
3: var myArray = new Array(5);
4: myArray[0] = “First Entry”;
5: myArray[1] = “Second Entry”;
6: myArray[2] = “Third Entry”;
7: myArray[3] = “Fourth Entry”;
8: myArray[4] = “Fifth Entry”;
9: var anotherArray = new Array(“First Entry”,”Second Entry”,”Third Entry”,”Fourth Entry”,”Fifth Entry”);
10: // -->
11: </script>

 

分割字符串

1: <script language=”JavaScript”>
2: <!--
3: var myVariable = “a,b,c,d”;
4: var stringArray = myVariable.split(“,”);
5: document.write(stringArray[0]);
6: document.write(stringArray[1]);
7: document.write(stringArray[2]);
8: document.write(stringArray[3]);
9: // -->
10: </script>

 

弹出确认框

1: <script language=”JavaScript”>
2: <!--
3: var result = window.confirm(“Click OK to continue”);
4: // -->
5: </script>

 

设定将来执行

1: <script>
2: <!--
3: function hello() {
4: window.alert(“Hello”);
5: }
6: window.setTimeout(“hello()”,5000);
7: // -->
8: </script>

定时执行函数

1: <script>

 

取消定时执行

1: <script>
2: <!--
3: function hello() {
4: window.alert(“Hello”);
5: }
6: var myTimeout = window.setTimeout(“hello()”,5000);
7: window.clearTimeout(myTimeout);
8: // -->
9: </script>

读取URL参数

1: <script language=”JavaScript”>
2: var urlParts = document.URL.split(“?”);
3: var parameterParts = urlParts[1].split(“&”);
4: for (i = 0; i < parameterParts.length; i++) {
5: var pairParts = parameterParts[i].split(“=”);
6: var pairName = pairParts[0];
7: var pairValue = pairParts[1];
8: document.write(pairName + “ ：“ +pairValue );
9: }
10: </script>

动态加载图像

1: <script language=”JavaScript”>
2: myImage = new Image;
3: myImage.src = “Tellers1.jpg”;
4: </script>

随机显示图像

1: <script language=”JavaScript”>
2: var imageList = new Array;
3: imageList[0] = “image1.jpg”;
4: imageList[1] = “image2.jpg”;
5: imageList[2] = “image3.jpg”;
6: imageList[3] = “image4.jpg”;
7: var imageChoice = Math.floor(Math.random() * imageList.length);
8: document.write(‘<img src=”’ + imageList[imageChoice] + ‘“>’);
9: </script>

函数实现的图像替换

1: <script language=”JavaScript”>
2: var source = 0;
3: var replacement = 1;
4: function createRollOver(originalImage,replacementImage) {
5: var imageArray = new Array;
6: imageArray[source] = new Image;
7: imageArray[source].src = originalImage;
8: imageArray[replacement] = new Image;
9: imageArray[replacement].src = replacementImage;
10: return imageArray;
11: }
12: var rollImage1 = createRollOver(“image1.jpg”,”rollImage1.jpg”);
13: </script>
14: <a href=”#” onMouseOver=”document.myImage1.src = rollImage1[replacement].src;”
15: onMouseOut=”document.myImage1.src = rollImage1[source].src;”>
16: <img src="/”image1.jpg"” width=100 name=”myImage1” border=0>
17: </a>

创建幻灯片

1: <script language=”JavaScript”>
2: var imageList = new Array;
3: imageList[0] = new Image;
4: imageList[0].src = “image1.jpg”;
5: imageList[1] = new Image;
6: imageList[1].src = “image2.jpg”;
7: imageList[2] = new Image;
8: imageList[2].src = “image3.jpg”;
9: imageList[3] = new Image;
10: imageList[3].src = “image4.jpg”;
11: function slideShow(imageNumber) {
12: document.slideShow.src = imageList[imageNumber].src;
13: imageNumber += 1;
14: if (imageNumber < imageList.length) {
15: window.setTimeout(“slideShow(“ + imageNumber + “)”,3000);
16: }
17: }
18: </script>
19: </head>
20: <body onLoad=”slideShow(0)”>
21: <img src="/”image1.jpg"” width=100 name=”slideShow”>

<script language=”JavaScript”>
2: var imageList = new Array;
3: imageList[0] = “image1.jpg”;
4: imageList[1] = “image2.jpg”;
5: imageList[2] = “image3.jpg”;
6: imageList[3] = “image4.jpg”;
7: var urlList = new Array;
8: urlList[0] = “http://some.host/”;
9: urlList[1] = “http://another.host/”;
10: urlList[2] = “http://somewhere.else/”;
11: urlList[3] = “http://right.here/”;
12: var imageChoice = Math.floor(Math.random() * imageList.length);
13: document.write(‘<a href=”’ + urlList[imageChoice] + ‘“><img src=”’ + imageList[imageChoice] + ‘“></a>’);
14: </script>

动态改变表单的action

1: <form name=”myForm” action=”login.html”>
2: Username: <input type=”text” name=”username”><br>
3: PassWord: <input type=”password” name=”password”><br>
4: <input type=”button” value=”Login” onClick=”this.form.submit();”>
5: <input type=”button” value=”Register” onClick=”this.form.action = ‘register.html’; this.form.submit();”>
6: <input type=”button” value=”Retrieve Password” onClick=”this.form.action = ‘password.html’; this.form.submit();”>
7: </form>

使用图像按钮

1: <form name=”myForm” action=”login.html”>
2: Username: <input type=”text” name=”username”><br>
3: Password: <input type=”password”name=”password”><br>
4: <input type=”image” src="/”login.gif"” value=”Login”>
5: </form>
6:

表单数据的加密

1: <SCRIPT LANGUAGE='JavaScript'>
2: <!--
3: function encrypt(item) {
4: var newItem = '';
5: for (i=0; i < item.length; i++) {
6: newItem += item.charCodeAt(i) + '.';
7: }
8: return newItem;
9: }
10: function encryptForm(myForm) {
11: for (i=0; i < myForm.elements.length; i++) {
12: myForm.elements[i].value = encrypt(myForm.elements[i].value);
13: }
14: }
15:
16: //-->
17: </SCRIPT>
18: <form name='myForm' onSubmit='encryptForm(this); window.alert(this.myField.value);'>
19: Enter Some Text: <input type=text name=myField><input type=submit>
20: </form>

弹出确认提示框

1: <script language=”JavaScript”>
2: var userChoice = window.confirm(“Click OK or Cancel”);
3: if (userChoice) {
4: document.write(“You chose OK”);
5: } else {
6: document.write(“You chose Cancel”);
7: }
8: </script>

 

提示输入

1: <script language=”JavaScript”>
2: var userName = window.PRompt(“Please Enter Your Name”,”Enter Your Name Here”);
3: document.write(“Your Name is “ + userName);
4: </script>

设置新窗口的位置

1: <script language=”JavaScript”>
2: window.open(“http://www.liu21st.com/”,”myNewWindow”,'height=300,width=300,left=200,screenX=200,top=100,screenY=100');
3: </script>

在IE中打开全屏窗口

1: <a href='#' onClick=”window.open('http://www.juxta.com/','newWindow','fullScreen=yes');”>Open a full-screen window</a>

在框架页面之间共享脚本
如果在frame1中html文件中有个脚本

1: function doAlert() {
2: window.alert(“Frame 1 is loaded”);
3: }

那么在frame2中可以如此调用该方法

1: <body onLoad=”parent.frame1.doAlert();”>
2: This is frame 2.
3: </body>

数据公用
可以在框架页面定义数据项，使得该数据可以被多个框架中的页面公用

1: <script language=”JavaScript”>
2: var persistentVariable = “This is a persistent value”;
3: </script>
4: <frameset cols=”50%,*”>
5: <frame name=”frame1” src="/”138a.html"”>
6: <frame name=”frame2” src="/”138b.html"”>
7: </frameset>

test  检查指定的字符串是否存在

var data = “123123″;
var reCat = /123/gi;
alert(reCat.test(data));  //true

//检查字符是否存在  g 继续往下走  i 不区分大小写

2） exec 返回查询值

var data = “123123,213,12312,312,3,Cat,cat,dsfsdfs,”;
var reCat = /cat/i;
alert(reCat.exec(data));  //Cat

match  得到查询数组

var data = “123123,213,12312,312,3,Cat,cat,dsfsdfs,”;
var reCat = /cat/gi;
var arrMactches = data.match(reCat)

for (var i=0;i < arrMactches.length ; i++)
{
alert(arrMactches[i]);   //Cat  cat
}

search  返回搜索位置  类似于indexof

var data = “123123,213,12312,312,3,Cat,cat,dsfsdfs,”;
var reCat = /cat/gi;
alert(data.search(reCat));  //23

校验搜索关键字
function isSearch(s)
{
var patrn=/^[^`~!@#$%^&*()+=|///][/]/{/}:;'/,.<>/?]{1}[^`~!@$%^&()+=|///]
        [/]/{/}:;'/,.<>?]{0,19}$/;
if (!patrn.exec(s)) return false
return true
}

(function (){
var h = 0;
handle = function (){return h++};
var f = function (){};
extend = function (a, b){
    f.PRototype = a;
    var ret = new f;
    if (typeof b == 'function') {
        b.call(ret);
    } else if (typeof b == 'object') {
        for (var key in b) {
            ret[key] = b[key];
        }
    }
    return ret;
};
})();

(function (){
ClassA = function (){
    this.hello = 'world';
};
ClassA.virtualmethod = handle();
ClassA.prototype = extend({}, function (){
    this.virtualmethod = function (){
        var impl = this[ClassA.virtualmethod];
        if (impl) {
            impl.apply(this, arguments);
        } else {
            alert('ClassA.virtualmethod not yet impl.');
        }
    };
});
})();

(function (){ // ClassB extend ClassA
ClassB = function (){
    ClassA.apply(this, arguments);
};

// 继承性
ClassB.prototype = extend(ClassA.prototype, function (){
    this[ClassA.virtualmethod] = function (){
        alert('this is ClassA.virtualmethod, impl in ClassB./nwill show this.hello.');
        alert('this.hello = ' + this.hello);
    }
   
    // 封装性
    this.test = this.virtualmethod;
    this.virtualmethod = undefined;
});
})();

(function (){ // ClassC extend ClassB
ClassC = function (){
    ClassB.apply(this, arguments);
};

ClassC.prototype = extend(ClassB.prototype, function (){
    // 多态性
    var impl = this[ClassA.virtualmethod];
    this[ClassA.virtualmethod] = function (){
        alert('this is ClassA.virtualmethod, impl in ClassC. /nwill run ClassB/'s impl.');
        impl.apply(this, arguments);
    };
});
})();

// test case
var a = new ClassA;
a.virtualmethod(); // not yet impl

var b = new ClassB;
b.test();
alert('b.virtualmethod is: '+b.virtualmethod);

var c = new ClassC;
c.test();

-

资料引用:http://www.knowsky.com/440780.html

2: <!--
3: function hello() {
4: window.alert(“Hello”);
5: window.setTimeout(“hello()”,5000);
6: }
7: window.setTimeout(“hello()”,5000);
8: // -->
9: </script>