javasript 函数

1、JavaScript就这么回事1：基础知识 1 创建脚本块 1: 2: JavaScript code goes here 3: 2 隐藏脚本代码 1: 2: 5: 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: 2: Hello to the non-JavaScript browser. 3: 4 链接外部脚本文件 1: 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

2、6: */ 6 输出到浏览器 1: document.write(“Hello”); 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: 2: 7: 10 字符串替换 1: thisVar.replace(“Monday”,”Friday”); 11 格式化字串 1: 2: ! 3: var myVariable = “Hello there”; 4: document.write(myVariable.big() + “”); 5: docum

3、ent.write(myVariable.blink() + “”); 6: document.write(myVariable.bold() + “”); 7: document.write(myVariable.fixed() + “”); 8: document.write(myVariable.fontcolor(“red”) + “”); 9: document.write(myVariable.fontsize(“18pt”) + “”); 10: document.write(myVariable.italics() + “”); 11: document.write(myVar

4、iable.small() + “”); 12: document.write(myVariable.strike() + “”); 13: document.write(myVariable.sub() + “”); 14: document.write(myVariable.sup() + “”); 15: document.write(myVariable.toLowerCase() + “”); 16: document.write(myVariable.toUpperCase() + “”); 17: 18: var firstString = “My String”; 19: va

5、r finalString = firstString.bold().toLowerCase().fontcolor(“red”); 20: / 21: 12 创建数组 1: 2: 11: 13 数组排序 1: 2: 11: 14 分割字符串 1: 2: 10: 15 弹出警告信息 1: 2: 5: 16 弹出确认框 1: 2: 5: 17 定义函数 1: 2: 8: 18 调用JS函数 1: Link text 2: Link text 19 在页面加载完成后执行函数 1: 2: Body of the page 3: 20 条件判断 1: 2: 7: 21 指定次数循环 1: 2: ! 3

6、: var myArray = new Array(3); 4: myArray0 = “Item 0”; 5: myArray1 = “Item 1”; 6: myArray2 = “Item 2”; 7: for (i = 0; i myArray.length; i+) 8: document.write(myArrayi + “”); 9: 10: / 11: 22 设定将来执行 1: 2: 8: 23 定时执行函数 1: 2: 9: 24 取消定时执行 1: 2: 9: 25 在页面卸载时候执行函数 1: 2: Body of the page 3: JavaScript就这么回事2

7、：浏览器输出 26 访问document对象 1: 2: var myURL = document.URL; 3: window.alert(myURL); 4: 27 动态输出HTML 1: 2: document.write(“Heres some information about this document:”); 3: document.write(“”); 4: document.write(“Referring Document: “ + document.referrer + “”); 5: document.write(“Domain: “ + document.domain

8、 + “”); 6: document.write(“URL: “ + document.URL + “”); 7: document.write(“”); 8: 28 输出换行 1: document.writeln(“a”); 2: document.writeln(“b”); 29 输出日期 1: 2: var thisDate = new Date(); 3: document.write(thisDate.toString(); 4: 30 指定日期的时区 1: 2: var myOffset = -2; 3: var currentDate = new Date(); 4: var

9、 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: 31 设置日期输出格式 1: 2: var thisDate =

10、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: 32 读取URL参数 1: 2: var urlParts = document.URL.s

11、plit(“?”); 3: var parameterParts = urlParts1.split(“&”); 4: for (i = 0; i parameterParts.length; i+) 5: var pairParts = parameterPartsi.split(“=”); 6: var pairName = pairParts0; 7: var pairValue = pairParts1; 8: document.write(pairName + “ ：“ +pairValue ); 9: 10: 你还以为HTML是无状态的么？ 33 打开一个新的document对象

12、1: 2: function newDocument() 3: document.open(); 4: document.write(“This is a New Document.”); 5: document.close(); 6: 7: 34 页面跳转 1: 2: window.location = “”; 3: 35 添加网页加载进度窗口 1: 2: 3: 4: var placeHolder = window.open(holder.html,placeholder,width=200,height=200); 5: 6: The Main Page 7: 8: 9: This is

13、 the main page 10: 11: JavaScript就这么回事3：图像 36 读取图像属性 1: 2: Width 3: 37 动态加载图像 1: 2: myImage = new Image; 3: myImage.src = “Tellers1.jpg”; 4: 38 简单的图像替换 1: 2: rollImage = new Image; 3: rollImage.src = “rollImage1.jpg”; 4: defaultImage = new Image; 5: defaultImage.src = “image1.jpg”; 6: 7: 9: 39 随机显示图

14、像 1: 2: var imageList = new Array; 3: imageList0 = “image1.jpg”; 4: imageList1 = “image2.jpg”; 5: imageList2 = “image3.jpg”; 6: imageList3 = “image4.jpg”; 7: var imageChoice = Math.floor(Math.random() * imageList.length); 8: document.write(); 9: 40 函数实现的图像替换 1: 2: var source = 0; 3: var replacement

15、= 1; 4: function createRollOver(originalImage,replacementImage) 5: var imageArray = new Array; 6: imageArraysource = new Image; 7: imageArraysource.src = originalImage; 8: imageArrayreplacement = new Image; 9: imageArrayreplacement.src = replacementImage; 10: return imageArray; 11: 12: var rollImage

16、1 = createRollOver(“image1.jpg”,”rollImage1.jpg”); 13: 14: 16: 17: 41 创建幻灯片 1: 2: var imageList = new Array; 3: imageList0 = new Image; 4: imageList0.src = “image1.jpg”; 5: imageList1 = new Image; 6: imageList1.src = “image2.jpg”; 7: imageList2 = new Image; 8: imageList2.src = “image3.jpg”; 9: image

17、List3 = new Image; 10: imageList3.src = “image4.jpg”; 11: function slideShow(imageNumber) 12: document.slideShow.src = imageListimageNumber.src; 13: imageNumber += 1; 14: if (imageNumber imageList.length) 15: window.setTimeout(“slideShow(“ + imageNumber + “)”,3000); 16: 17: 18: 19: 20: 21: 42 随机广告图片

18、 1: 2: var imageList = new Array; 3: imageList0 = “image1.jpg”; 4: imageList1 = “image2.jpg”; 5: imageList2 = “image3.jpg”; 6: imageList3 = “image4.jpg”; 7: var urlList = new Array; 8: urlList0 = “http:/some.host/”; 9: urlList1 = “http:/another.host/”; 10: urlList2 = “http:/somewhere.else/”; 11: url

19、List3 = “http:/right.here/”; 12: var imageChoice = Math.floor(Math.random() * imageList.length); 13: document.write(); 14: 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: 2: 3: 4: First Choice 5: Second Choice 6: 7: 8: 9: 44 访问表单中的文本框内容 e);Check Text Field 45 动态复制文本框内容 1: 2: Enter some Text: 3: Cop

20、y Text: 4: 5: Copy Text Field 46 侦测文本框的变化 1: 2: Enter some Text: 3: 47 访问选中的Select 1: 2: 3: 1 4: 2 5: 3 6: 7: 8: Check Selection List 48 动态增加Select项 ngth+; 9: document.myForm.mySelect.optionsdocument.myForm.mySelect.length - 1.text = “3”; 10: document.myForm.mySelect.optionsdocument.myForm.mySelect.

21、length - 1.value = “Third Choice”; 11: 49 验证表单字段 1: 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: 9: 10: Text Field: 11: 12: 50 验证Select项 1: function checkList(selection) 2: if (selection.length = 0) 3: windo

22、w.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: 2: Username: 3: Password: 4: 5: 6: 7: 52 使用图像按钮 1: 2: Username: 3: Password: 4: 5: 6: 53 表单数据的加密 1: 2: ! 3: function encrypt(item) 4: var newItem = ; 5: for (i=0; i item.length; i+) 6: new

23、Item += item.charCodeAt(i) + .; 7: 8: return newItem; 9: 10: function encryptForm(myForm) 11: for (i=0; i 17: 18: 19: Enter Some Text: 20: 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: 2: window.status = “A new status message”; 3: 55 弹出确认提示框 1: 2: var userChoice = window.confirm(“Click OK or Cancel”); 3

24、: if (userChoice) 4: document.write(“You chose OK”); 5: else 6: document.write(“You chose Cancel”); 7: 8: 56 提示输入 1: 2: var userName = mpt(“Please Enter Your Name”,”Enter Your Name Here”); 3: document.write(“Your Name is “ + userName); 4: 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: 3: wind

25、ow.open(“”,”myNewWindow”); 4: 58 设置新窗口的大小 1: 2: window.open(“”,”myNewWindow”,height=300,width=300); 3: 59 设置新窗口的位置 1: 2: window.open(“”,”myNewWindow”,height=300,width=300,left=200,screenX=200,top=100,screenY=100); 3: 60 是否显示工具栏和滚动栏 1: 2: window.open(“http: 61 是否可以缩放新窗口的大小 1: 2: window.open( , myNewW

26、indow, resizable=yes ); 62 加载一个新的文档到当前窗口 1: Open New Document 63 设置页面的滚动位置 1: 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: 64 在IE中打开全屏窗口 1: a href=# onClick=”window.open( a full-screen window 65

27、 新窗口和父窗口的操作 1: 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: 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: 2: var newWindow = window.open(“”,”newWindow”); 3: newWindow.document.open(); 4: newWindow.document.write(“This is a new win

28、dow”); 5: newWIndow.document.close(); 6: 67 加载页面到框架页面 1: 2: 3: 4: 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: 2: This is frame 2. 3: 69 数据公用 可以在框架页

29、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: 2: var persistentVariable = “This is a persistent value”; 3: 4: 5: 6: 7: 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: 2: 3: 4: 5: 教程：事半功倍系列之javascript From:向东IT博客 本文由经典论坛 邓永炎 整理 清华大学出版的事半功倍系列 javascript,本人照着书敲出来的,有些翻译了一下.前几

30、年看了一下,最近无事,重新翻了翻,很有帮助.本书应该有光盘的,但学校的书,光盘不知在哪.希望对你学 javascript有帮助 第一章javascript简介 1.在地址栏输入javascript语句 Javascript:Document.write(显示文字) 2.将javascript嵌入 HTML文档 document.bgColor=blue 第二章 使用变量和数组 1.声明变量 Var answer1,answer2,answer3,answer4; answer1=9; answer2=2.5 answer3=Milkey May answer4=true 2.使用整数 var decimalNum,hexadecimalNum,octalNum decimalNum=24 hexadecimalNum=024 octalNum=024 document.write(显示十进制数：+ decimalNum+) document.write(显示十六进制数：+ hexadecimalNum +) document.write(显示八进制数：+ octalNum +) 3.使用浮点数 script l4.使用布尔值