整理的比较不错的JavaScript的方法和技巧


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[i] + “<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>



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