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距离某天还有天

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<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<title>javascript对象</title> 
<script language="javascript" type="text/javascript">

var regExp=/\s\*/g; 
/*---------------string对象------------------*/ 
var str="this *is *test *string"; 
var sTxt=str.charAt(3); 
var aTxt=str.charCodeAt(3); 
var btxt=str.indexOf("s"); 
var cTxt=str.slice(0,4); 
var dTxt=str.split(" "); 
var subTxt=str.substr(0,4); 
var regTxt=str.match(regExp); 
var regSearchTxt=str.search(regExp); 
document.writeln("原始字符串："+str+"<br>"); 
document.writeln("charAt(3),返回索引字符："+sTxt+"<br>"); 
document.writeln("charCodeAt(3),返回unicode字符代码："+aTxt+"<br>"); 
document.writeln("indexOf,返回指定字符索引"+btxt+"<br>"); 
document.writeln("slice(0,4),返回0，4之间的字符:"+cTxt+"<br>"); 
document.writeln("split(' '),以空格截取字符成数组："+dTxt+"<br>"); 
document.writeln("substr(0,4),截取两个索引之间的字符："+subTxt+"<br>"); 
document.writeln("match,返回匹配的字符串："+regTxt+"<br>"); 
document.writeln("search,返回匹配的字符串的便宜位置："+regSearchTxt+"<br>");

/*-----------------正则表达式---------------*/ 
//test 
var result_tst=regExp.test(str); 
document.writeln("regExp.test(str),返回是否匹配："+result_tst+"<br>"); 
//exec 
var result_exec=regExp.exec(str); 
document.writeln("返回匹配的内容："+result_exec+"<br>"); 
var result=str.replace(regExp,"_"); 
document.writeln("返回替换的内容："+result+"<br>");

//匹配规则 
var reg2=/:\s*\w*\s*[0-9]+\s[0-9]{4}/; 
var reg1=/:\D*\s*\d+\s\d+/; 
var reg3=/w*@w+.w/; 
var str2="this is a date: march 12 2010"; 
var eTxt=str2.match(reg2); 
document.writeln(eTxt+"<br/ >");

//*----------------Date对象--------------------*/ 
var now=new Date(); 
var hours=now.getHours()+7*24; 
now.setHours(hours);

document.write("一个星期后是："+now+"<br>"); 
document.write("现在是"+now.getFullYear() 
+"年"+(now.getMonth()+1)+"月"+now.getDate() 
+"日"+now.getHours()+"时"+now.getMinutes() 
+"分"+now.getSeconds()+"秒"+"<br>"); 
//计时器 
function countTime(){ 
var targetTime = new Date(2010,6,24,12,0,0,0); 
var nowTime = new Date(); 
//距离目标时间 
var distanTime=targetTime.getTime()-nowTime.getTime(); 
days = Math.floor( distanTime / 1000 / 60 / 60 / 24); 
hours = Math.floor(distanTime/ 1000 / 60 / 60 - (24 * days)); 
minutes = Math.floor( distanTime/1000/60-(24*60*days)-(60*hours)); 
seconds =distanTime/1000-(24*60*60*days)-(60*60*hours)-(60*minutes); 
secondsRound = Math.round(seconds);

document.getElementById("days").innerHTML="<font color=red>"+days+"</font>"; 
document.getElementById("time").innerHTML=hours+":"+minutes+":"+secondsRound; 
} 
setInterval("countTime()",250);

//数组 
var firstArr=new Array("one","two","three"); 
var secondArr=["one","two","three"]; 
var remove=firstArr.slice(2,3); 
var splicArr=secondArr.splice(1,1); 
document.writeln(remove+"<br>"); 
document.writeln(splicArr+"<br>");

//队列 
var fifoArr=new Array(); 
fifoArr.push("apple"); 
fifoArr.push("banana"); 
var length=fifoArr.push("cherry"); 
document.writeln("数组的长度是："+length+" 数组内容是："+fifoArr+"<br>"); 
fifoArr.shift(); 
document.writeln("使用shift命令删除第一个元素："+fifoArr+"<br>"); 
fifoArr.unshift("addFruite"); 
document.writeln("使用unshift命令增加第一个元素："+fifoArr+"<br>"); 
fifoArr.pop(); 
document.writeln("使用pop命令最后一个元素："+fifoArr+"<br>"); 
</script> 
<script type="text/javascript" src="/js/jquery.3.5.2.min.m.js"></script>
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<span>距离某天还有</span><span id="days"></span>天<span id="time"></span> 
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