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  • js基础

    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="/"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="/"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='javaScript'>  
    4: var placeHolder = window.open('holder.html','placeholder','width=200,height=200');  
    5: </script>  
    6: <title>The Main Page</title>  
    7: </head>  
    8: <body onLoad='placeHolder.close()'>  
    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="/"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="/"myUrl"" onMouseOver="document.myImage.src = rollImage.src;"  
    8: onMouseOut="document.myImage.src = defaultImage.src;">  
    9: <img src="/"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="/"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="/"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='#' onClick='window.alert(document.myForm.myText.value);'>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='#' onClick='alert(document.myForm.mySelect.value);'>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="/"login.gif"" value="Login">  
    5: </form>  
    6:
    53 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.value = encrypt(myForm.elements.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>
    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",'height=300,width=300');  
    3: </script>
    59 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>
    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('http://www.liu21st.com/' , 'myNewWindow', 'resizable=yes' );</script>
    62 加载一个新的文档到当前窗口  
    1: <a href='#' onClick='document.location = '125a.html';' >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='#' onClick="window.open('http://www.juxta.com/','newWindow','fullScreen=yes');">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="/"135a.html"">  
    3: <frame name="frame2" src="/"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="/"138a.html"">  
    6: <frame name="frame2" src="/"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="/"140code.html"">  
    3: <frame name="frame1" src="/"140a.html"">  
    4: <frame name="frame2" src="/"140b.html"">
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  • 原文地址:https://www.cnblogs.com/ahjesus/p/1998636.html
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