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JS方法与技巧

 
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JS方法与技巧
2010年08月03日
  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
  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: ");
  5: document.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(myVariable.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: var 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: ");
  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: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("Here's some information about this document:");
  3: document.write("");
  4: document.write("Referring Document: " + document.referrer + "");
  5: document.write("Domain: " + document.domain + "");
  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 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 = 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.split("?");
  3: var parameterParts = urlParts[1].split("&");
  4: for (i = 0; i  
  你还以为HTML是无状态的么?
  33 打开一个新的document对象
  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 = "http://www.liu21st.com/";
  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 the main page
  10: 
  11:  
  JavaScript就这么回事3:图像 
  36 读取图像属性
  1: 
  2: Widt h
  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 随机显示图像
  1: 
  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('');
  9:  
  40 函数实现的图像替换
  1: 
  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: 
  14: 
  16: 
  17:  
  41 创建幻灯片
  1: 
  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 
  19: 
  20: 
  21:  
  42 随机广告图片
  1: 
  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('');
  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
  1: 
  2: 
  3: 
  4: Check Text Field 
  45 动态复制文本框内容
  1: 
  2: Enter some Text: 
  3: Copy 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: Ch eck Selection List 
  48 动态增加Select项
  1: 
  2: 
  3: 1
  4: 2
  5: 
  6: 
  7: 
  8: document.myForm.mySelect.length++;
  9: document.myForm.mySelect.options[document.myForm.m ySelect.length - 1].text = "3";
  10: document.myForm.mySelect.options[document.myForm.m ySelect.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: 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: 
  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: 
  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: 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 = window.prompt("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: window.open("http://www.liu21st.com/","myNewWindow ");
  4:  
  58 设置新窗口的大小 1: 
  2: window.open("http://www.liu21st.com/","myNewWindow ",'height=300,width=300');
  3:   59 设置新窗口的位置
  1: 
  2: window.open("http://www.liu21st.com/","myNewWindow ",'height=300,width=300,left=200,screenX=200,top=10 0,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('http://www.liu21st.com/' , 'myNewWindow', '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: Open a full-screen window 
  65 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 window");
  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:  
  本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/fantian830211/archive/2009/05 /16/4192047.aspx
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