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[Java教程]JavaScript总结1


JavaScript就这么回事
JavaScript
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JavaScript就这么回事
适合阅读范围:对JavaScript一无所知~离精通只差一步之遥的人 
基础知识:HTML 


JavaScript就这么回事1:基础知识 

1 创建脚本块 

1: <script language=”JavaScript”> 
2: JavaScript code goes here 
3: </script> 

 

2 隐藏脚本代码 

1: <script language=”JavaScript”> 
2: <!-- 
3: document.write(“Hello”); 
4: // --> 
5: </script> 


在不支持JavaScript的浏览器中将不执行相关代码 

3 浏览器不支持的时候显示 

1: <noscript> 
2: Hello to the non-JavaScript browser. 
3: </noscript> 

 

4 链接外部脚本文件 

1: <script language=”JavaScript” src="http://www.cnblogs.com//”filename.js"”></script> 


5 注释脚本 

1: // This is a comment 
2: document.write(“Hello”); // This is a comment 
3: /* 
4: All of this 
5: is a comment 
6: */ 

 

6 输出到浏览器 

1: document.write(“<strong>Hello</strong>”); 

 

7 定义变量 

1: var myVariable = “some value”; 

 

8 字符串相加 

1: var myString = “String1” + “String2”; 

 

9 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> 

 

10 字符串替换 

1: thisVar.replace(“Monday”,”Friday”); 


11 格式化字串 

1: <script language=”JavaScript”> 
2: <!-- 
3: var myVariable = “Hello there”; 
4: document.write(myVariable.big() + “<br>”); 
5: document.write(myVariable.blink() + “<br>”); 
6: document.write(myVariable.bold() + “<br>”); 
7: document.write(myVariable.fixed() + “<br>”); 
8: document.write(myVariable.fontcolor(“red”) + “<br>”); 
9: document.write(myVariable.fontsize(“18pt”) + “<br>”); 
10: document.write(myVariable.italics() + “<br>”); 
11: document.write(myVariable.small() + “<br>”); 
12: document.write(myVariable.strike() + “<br>”); 
13: document.write(myVariable.sub() + “<br>”); 
14: document.write(myVariable.sup() + “<br>”); 
15: document.write(myVariable.toLowerCase() + “<br>”); 
16: document.write(myVariable.toUpperCase() + “<br>”); 
17: 
18: var firstString = “My String”; 
19: var finalString = firstString.bold().toLowerCase().fontcolor(“red”); 
20: // --> 
21: </script> 

 

12 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> 

 

13 数组排序 

1: <script language=”JavaScript”> 
2: <!-- 
3: var myArray = new Array(5); 
4: myArray[0] = “z”; 
5: myArray[1] = “c”; 
6: myArray[2] = “d”; 
7: myArray[3] = “a”; 
8: myArray[4] = “q”; 
9: document.write(myArray.sort()); 
10: // --> 
11: </script> 

 

14 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> 

 

15 弹出警告信息 

1: <script language=”JavaScript”> 
2: <!-- 
3: window.alert(“Hello”); 
4: // --> 
5: </script> 

 

16 弹出确认框 

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

 

17 定义函数 

1: <script language=”JavaScript”> 
2: <!-- 
3: function multiple(number1,number2) { 
4: var result = number1 * number2; 
5: return result; 
6: } 
7: // --> 
8: </script> 

 

18 调用JS函数 

1: <a href=”#” onClick=”functionName()”>Link text</a> 
2: <a href="http://www.cnblogs.com//”javascript:functionName"()”>Link text</a> 

 

19 在页面加载完成后执行函数 

1: <body onLoad=”functionName();”> 
2: Body of the page 
3: </body> 


20 条件判断 

1: <script> 
2: <!-- 
3: var userChoice = window.confirm(“Choose OK or Cancel”); 
4: var result = (userChoice == true) ? “OK” : “Cancel”; 
5: document.write(result); 
6: // --> 
7: </script> 

 

21 指定次数循环 

1: <script> 
2: <!-- 
3: var myArray = new Array(3); 
4: myArray[0] = “Item 0”; 
5: myArray[1] = “Item 1”; 
6: myArray[2] = “Item 2”; 
7: for (i = 0; i < myArray.length; i++) { 
8: document.write(myArray + “<br>”); 
9: } 
10: // --> 
11: </script> 

 

22 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> 

 

23 定时执行函数 

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

 

24 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> 

 

25 在页面卸载时候执行函数 

1: <body onUnload=”functionName();”> 
2: Body of the page 
3: </body> 

JavaScript就这么回事2:浏览器输出 


26 访问document对象 

1: <script language=”JavaScript”> 
2: var myURL = document.URL; 
3: window.alert(myURL); 
4: </script> 

 

27 动态输出HTML 

1: <script language=”JavaScript”> 
2: document.write(“<p>Here’s some information about this document:</p>”); 
3: document.write(“<ul>”); 
4: document.write(“<li>Referring Document: “ + document.referrer + “</li>”); 
5: document.write(“<li>Domain: “ + document.domain + “</li>”); 
6: document.write(“<li>URL: “ + document.URL + “</li>”); 
7: document.write(“</ul>”); 
8: </script> 


28 输出换行 

1: document.writeln(“<strong>a</strong>”); 
2: document.writeln(“b”); 

 

29 输出日期 

1: <script language=”JavaScript”> 
2: var thisDate = new Date(); 
3: document.write(thisDate.toString()); 
4: </script> 

 

30 指定日期的时区 

1: <script language=”JavaScript”> 
2: var myOffset = -2; 
3: var currentDate = new Date(); 
4: var userOffset = currentDate.getTimezoneOffset()/60; 
5: var timeZoneDifference = userOffset - myOffset; 
6: currentDate.setHours(currentDate.getHours() + timeZoneDifference); 
7: document.write(“The time and date in Central Europe is: “ + currentDate.toLocaleString()); 
8: </script> 


31 设置日期输出格式 

1: <script language=”JavaScript”> 
2: var thisDate = new Date(); 
3: var thisTimeString = thisDate.getHours() + “:” + thisDate.getMinutes(); 
4: var thisDateString = thisDate.getFullYear() + “/” + thisDate.getMonth() + “/” + thisDate.getDate(); 
5: document.write(thisTimeString + “ on “ + thisDateString); 
6: </script> 


32 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.split(“=”); 
6: var pairName = pairParts[0]; 
7: var pairValue = pairParts[1]; 
8: document.write(pairName + “ :“ +pairValue ); 
9: } 
10: </script> 

你还以为HTML是无状态的么? 

33 打开一个新的document对象 

1: <script language=”JavaScript”> 
2: function newDocument() { 
3: document.open(); 
4: document.write(“<p>This is a New Document.</p>”); 
5: document.close(); 
6: } 
7: </script> 

 

34 页面跳转 

1: <script language=”JavaScript”> 
2: window.location = “http://www.liu21st.com/”; 
3: </script> 

 

35 添加网页加载进度窗口 

1: <html> 
2: <head> 
3: <script language=&#39;javaScript&#39;> 
4: var placeHolder = window.open(&#39;holder.html&#39;,&#39;placeholder&#39;,&#39;width=200,height=200&#39;); 
5: </script> 
6: <title>The Main Page</title> 
7: </head> 
8: <body onLoad=&#39;placeHolder.close()&#39;> 
9: <p>This is the main page</p> 
10: </body> 
11: </html> 

 

JavaScript就这么回事3:图像 

 

36 读取图像属性 

1: <img src="http://www.cnblogs.com//”image1.jpg"” name=”myImage”> 
2: <a href=”# ” onClick=”window.alert(document.myImage.width)”>Width</a> 
3: 


37 动态加载图像 

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


38 简单的图像替换 

1: <script language=”JavaScript”> 
2: rollImage = new Image; 
3: rollImage.src = “rollImage1.jpg”; 
4: defaultImage = new Image; 
5: defaultImage.src = “image1.jpg”; 
6: </script> 
7: <a href="http://www.cnblogs.com//”myUrl"” onMouseOver=”document.myImage.src = rollImage.src;” 
8: onMouseOut=”document.myImage.src = defaultImage.src;”> 
9: <img src="http://www.cnblogs.com//”image1.jpg"” name=”myImage” width=100 height=100 border=0> 


39 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> 


40 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="http://www.cnblogs.com//”image1.jpg"” width=100 name=”myImage1” border=0> 
17: </a> 


41 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="http://www.cnblogs.com//”image1.jpg"” width=100 name=”slideShow”> 


42 随机广告图片 

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 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> 

JavaScript就这么回事4:表单 


还是先继续写完JS就这么回事系列吧~ 
43 表单构成 

1: <form method=”post” action=”target.html” name=”thisForm”> 
2: <input type=”text” name=”myText”> 
3: <select name=”mySelect”> 
4: <option value=”1”>First Choice</option> 
5: <option value=”2”>Second Choice</option> 
6: </select> 
7: <br> 
8: <input type=”submit” value=”Submit Me”> 
9: </form> 


44 访问表单中的文本框内容 

1: <form name=”myForm”> 
2: <input type=”text” name=”myText”> 
3: </form> 
4: <a href=&#39;#&#39; onClick=&#39;window.alert(document.myForm.myText.value);&#39;>Check Text Field</a> 


45 动态复制文本框内容 

1: <form name=”myForm”> 
2: Enter some Text: <input type=”text” name=”myText”><br> 
3: Copy Text: <input type=”text” name=”copyText”> 
4: </form> 
5: <a href=”#” onClick=”document.myForm.copyText.value = 
6: document.myForm.myText.value;”>Copy Text Field</a> 


46 侦测文本框的变化 

1: <form name=”myForm”> 
2: Enter some Text: <input type=”text” name=”myText” onChange=”alert(this.value);”> 
3: </form> 


47 访问选中的Select 

1: <form name=”myForm”> 
2: <select name=”mySelect”> 
3: <option value=”First Choice”>1</option> 
4: <option value=”Second Choice”>2</option> 
5: <option value=”Third Choice”>3</option> 
6: </select> 
7: </form> 
8: <a href=&#39;#&#39; onClick=&#39;alert(document.myForm.mySelect.value);&#39;>Check Selection List</a> 


48 动态增加Select项 

1: <form name=”myForm”> 
2: <select name=”mySelect”> 
3: <option value=”First Choice”>1</option> 
4: <option value=”Second Choice”>2</option> 
5: </select> 
6: </form> 
7: <script language=”JavaScript”> 
8: document.myForm.mySelect.length++; 
9: document.myForm.mySelect.options[document.myForm.mySelect.length - 1].text = “3”; 
10: document.myForm.mySelect.options[document.myForm.mySelect.length - 1].value = “Third Choice”; 
11: </script> 


49 验证表单字段 

1: <script language=”JavaScript”> 
2: function checkField(field) { 
3: if (field.value == “”) { 
4: window.alert(“You must enter a value in the field”); 
5: field.focus(); 
6: } 
7: } 
8: </script> 
9: <form name=”myForm” action=”target.html”> 
10: Text Field: <input type=”text” name=”myField”onBlur=”checkField(this)”> 
11: <br><input type=”submit”> 
12: </form> 


50 验证Select项 

1: function checkList(selection) { 
2: if (selection.length == 0) { 
3: window.alert(“You must make a selection from the list.”); 
4: return false; 
5: } 
6: return true; 
7: } 


51 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> 


52 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="http://www.cnblogs.com//”login.gif"” value=”Login”> 
5: </form> 
6: 


53 表单数据的加密 

1: <SCRIPT LANGUAGE=&#39;JavaScript&#39;> 
2: <!-- 
3: function encrypt(item) { 
4: var newItem = &#39;&#39;; 
5: for (i=0; i < item.length; i++) { 
6: newItem += item.charCodeAt(i) + &#39;.&#39;; 
7: } 
8: return newItem; 
9: } 
10: function encryptForm(myForm) { 
11: for (i=0; i < myForm.elements.length; i++) { 
12: myForm.elements.value = encrypt(myForm.elements.value); 
13: } 
14: } 
15: 
16: //--> 
17: </SCRIPT> 
18: <form name=&#39;myForm&#39; onSubmit=&#39;encryptForm(this); window.alert(this.myField.value);&#39;> 
19: Enter Some Text: <input type=text name=myField><input type=submit> 
20: </form> 

 


JavaScript就这么回事5:窗口和框架 


54 改变浏览器状态栏文字提示 

1: <script language=”JavaScript”> 
2: window.status = “A new status message”; 
3: </script> 


55 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> 


56 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> 


57 打开一个新窗口 

1: //打开一个名称为myNewWindow的浏览器新窗口 
2: <script language=”JavaScript”> 
3: window.open(“http://www.liu21st.com/”,”myNewWindow”); 
4: </script> 


58 设置新窗口的大小 

1: <script language=”JavaScript”> 
2: window.open(“http://www.liu21st.com/”,”myNewWindow”,&#39;height=300,width=300&#39;); 
3: </script> 


59 设置新窗口的位置 

1: <script language=”JavaScript”> 
2: window.open(“http://www.liu21st.com/”,”myNewWindow”,&#39;height=300,width=300,left=200,screenX=200,top=100,screenY=100&#39;); 
3: </script> 


60 是否显示工具栏和滚动栏 

1: <script language=”JavaScript”> 
2: window.open(“http: 


61 是否可以缩放新窗口的大小 

1: <script language=”JavaScript”> 
2: window.open(&#39;http://www.liu21st.com/&#39; , &#39;myNewWindow&#39;, &#39;resizable=yes&#39; );</script> 


62 加载一个新的文档到当前窗口 

1: <a href=&#39;#&#39; onClick=&#39;document.location = &#39;125a.html&#39;;&#39; >Open New Document</a> 


63 设置页面的滚动位置 

1: <script language=”JavaScript”> 
2: if (document.all) { //如果是IE浏览器则使用scrollTop属性 
3: document.body.scrollTop = 200; 
4: } else { //如果是NetScape浏览器则使用pageYOffset属性 
5: window.pageYOffset = 200; 
6: }</script> 


64 在IE中打开全屏窗口 

1: <a href=&#39;#&#39; onClick=”window.open(&#39;http://www.juxta.com/&#39;,&#39;newWindow&#39;,&#39;fullScreen=yes&#39;);”>Open a full-screen window</a> 


65 新窗口和父窗口的操作 

1: <script language=”JavaScript”> 
2: //定义新窗口 
3: var newWindow = window.open(“128a.html”,”newWindow”); 
4: newWindow.close(); //在父窗口中关闭打开的新窗口 
5: </script> 
6: 在新窗口中关闭父窗口 
7: window.opener.close() 


66 往新窗口中写内容 

1: <script language=”JavaScript”> 
2: var newWindow = window.open(“”,”newWindow”); 
3: newWindow.document.open(); 
4: newWindow.document.write(“This is a new window”); 
5: newWIndow.document.close(); 
6: </script> 


67 加载页面到框架页面 

1: <frameset cols=”50%,*”> 
2: <frame name=”frame1” src="http://www.cnblogs.com//”135a.html"”> 
3: <frame name=”frame2” src="http://www.cnblogs.com//”about:blank"”> 
4: </frameset> 
5: 在frame1中加载frame2中的页面 
6: parent.frame2.document.location = “135b.html”; 


68 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> 


69 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="http://www.cnblogs.com//”138a.html"”> 
6: <frame name=”frame2” src="http://www.cnblogs.com//”138b.html"”> 
7: </frameset> 


这样在frame1和frame2中都可以使用变量persistentVariable 
70 框架代码库 
根据以上的一些思路,我们可以使用一个隐藏的框架页面来作为整个框架集的代码库 

1: <frameset cols=”0,50%,*”> 
2: <frame name=”codeFrame” src="http://www.cnblogs.com//”140code.html"”> 
3: <frame name=”frame1” src="http://www.cnblogs.com//”140a.html"”> 
4: <frame name=”frame2” src="http://www.cnblogs.com//”140b.html"”> 
5: </frameset>