JavaScript 基础语法与脚本嵌入指南

JavaScript脚本嵌入方式

创建脚本块

<script language="JavaScript">

JavaScript code goes here

</script>

隐藏脚本代码

<script language="JavaScript">

document.write("Hello");

</script>

浏览器不支持的时候显示

<noscript>

Hello to the non-JavaScript browser.

</noscript>

链接外部脚本文件

<script language="JavaScript" src="/"youname.js""></script>

脚本注释与输出

注释脚本

// This is a comment

document.write("Hello"); // This is a comment

All of this

is a comment

输出到浏览器

document.write("<strong>输出内容</strong>");

变量与字符串操作

定义变量

var myVariable = "some value";

字符串相加

var myString = "String1" + "String2";

字符串搜索

<script language="JavaScript">

var myVariable = "Hello there";

var therePlace = myVariable.search("there");

document.write(therePlace);

</script>

字符串替换

thisVar.replace("Monday","Friday");