变量
还是先看例子,内容很少,也很简单:JavaScript变量练习(完整代码)<html><head><script language="JavaScript"><!-- hide me
// load up some variablesvar secs_per_min = 60;var mins_per_hour = 60;var hours_per_day = 24;var days_per_year = 365;//当首次用一变量时,应以“var”申明。 尽管以var 作为变量申明严格说并不必要,但这是一个好习惯。//对变量名大小写敏感
// do some calculationsvar secs_per_day = secs_per_min * mins_per_hour * hours_per_day;var secs_per_year = secs_per_day * days_per_year;
//here's how to use JavaScript to write out HTML//这里介绍如何用JavaScript写变量和网页。document.writeln("<b>The monkey dances ");//可用document.writeln() 来写文本和网页中的HTMLdocument.writeln(secs_per_year);document.writeln(" seconds per year.</b><p>");
// end hiding --></script></head></html>字符串
一个字符串使用的小例:JavaScript字符串练习(完整代码)<html><head><script language="JavaScript"><!-- hide me
// load up some variablesvar nice_monkey = "The monkey smiles at you and recites Shakespeare.";var bad_monkey = "The monkey scowls at you and burps.";//申报变量时即给变量赋值,使它等于这些字符串,于是当你想写这些字符串时,你可写:
document.writeln(nice_monkey+"<br>");
//prompt() 方法用于显示可提示用户进行输入的对话框。var monkey = prompt("What's the monkey's name?", "The monkey");//这里我们称为用户反馈提示方式,当它被调用时,启动一个对话框请求用户输入信息。用//户完成后敲OK返回信息。在上行中返回信息放入其变量中。
var demanding="demands, no, insists upon receiving";var tech=" a computer that won't crash, and a homemade brower!";var techy_monkey = monkey + demanding + tech;
document.writeln(techy_monkey+"<br>");document.writeln(techy_monkey.fontcolor('red'));//这一句的意思是:将字符串 techy_monkey 用红色显示在屏幕上
//更多关于 字符串使用 如下://var italic_hippy = hippy_monkey.italics();//这一行是说:使该字符串包含变量以斜体显示//也就是 var italic_hippy = "<i>" + hippy_monkey + "</i>";
//var shouting_hippy= hippy_monkey.toUpperCase();//这一行讲述的技巧是在HTML中实现不了的,它使得hippy_monkey中所有字符以大写显示
//var red_bold_tech = bold_tech.fontcolor('red');//这一行显示改变字符串属性//也可以这样 var red_bold_tech = "<font color='red'>" + bold_tech + "</font>";
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