1 创建脚本块
<script language=”JavaScript”>
JavaScript code goes here
</script>
2 隐藏脚本代码
<script language=”JavaScript”>
<!--
document.write(“Hello”);
// -->
</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
<noscript>
Hello to the non-JavaScript browser.
</noscript>
4 链接外部脚本文件
<script language=”JavaScript” src="/”filename.js"”></script>
注释脚本
// This is a comment
document.write(“Hello”); // This is a comment
/**//*
All of this is a comment
*/
6 输出到浏览器
document.write(“<strong>Hello</strong>”);
7 定义变量
1var myVariable = “some value”;
8 字符串相加
1var 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 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);
4myArray[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>
12
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>
9
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>
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