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> 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>”); 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”);