Javascript就这么回事JavaScript信息来源：网络
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="/”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.getDat
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