每道题都有答案,大多数答案亲测正确。
1.js中“5”+4=?
答案:54
2.js中void(0)=?
答案:undefined
3.js中NaN*4=?
答案:NaN
4.js中null*4.5=?
答案:0
5.js中alert(5*015===5.075)
答案:false,结果不一样。
6.js中13>>2=? -13>>2=?
答案:3 ,-4 ,除以4,然后向下取整。
7.js中13|5=? 13&5=?
答案:按位或:13,按位与:5。
8.js中怎么获取当前日期的月份
答案:
<span style="font-size:18px;">var date = new Date(); var mouth = date.getMonth();</span>
9.js中数组排序方法是?该方法实现了什么的排序算法?
答案:排序方法是sort(),实现了按字符排序的算法。
例var arr = [1,2,55,12,88];arr.sort();//ASCII字符代码从小到大排,arr结果为[1,12,2,55,88];
10.js中怎么判断chrome浏览器?
答案:
<span style="font-size:18px;">isChrome = window.navigator.userAgent.indexOf("Chrome") !== -1;// 当isChrome=true时,为chrome浏览器</span>
11.js中var b=”hello”;a=b; 怎么显示出a的值(貌似这题最简单了)
答案:
<span style="font-size:18px;">document.write(a);</span>
<span style="font-size:18px;"><xml> <list> <item> <id>12</id><name>张三</name> </item> <item><id>13</id><name>李四</name> </item> </list> </xml></span>
<span style="font-size:18px;">var lists = [{"id":"12","name":"张三"},{"id":"13","name":"李四"}];</span>
13.js中怎么把十进制数123转化成二进制数?
答案:
<span style="font-size:18px;">123.toString(2);</span>
<span style="font-size:18px;"><script type=”text/javascript”> document.onkeydown = function(event){ event = event?event:window.event; if (event.keyCode == 13) { alert(“hello world!”); } }; </script></span>
1.js中var s=”tencent is sb”,编写js使其变成tencent1 is2 sb3
<span style="font-size:18px;"><script type="text/javascript"> var s = "tencent is perfect"; var array = s.split(" "); s = ""; for(var i=0; i < array.length; i ++){ s += array[i] + (i+1) + " "; } document.write(s); </script></span>
2.编写js的类,使其拥有public和private类型的属性和方法
<span style="font-size:18px;"><script type="text/javascript"> function Person(_name,_age,_sex,_salary){ //public this.name = _name; this.age = _age; //privare var sex = _sex; var salary = _salary; //public method this.getName = function(){ return this.name; } this.getAge = function(){ return this.age; } //private methd function getSex(){ return sex; } function getSalary(){ return salary; } this.display = function(){ document.write(this.getName() + "---" + this.getAge() + "---" + getSex() + "----" + getSalary()); } } var smirk = new Person("zy","21","f","5000"); smirk.display(); </script></span>
答:优化大师,超级兔子
SEO(Search Engine Optimization)缩写而来, 中文意译为“搜索引擎优化”。
SEO优化工具:
1.TrafficTravis——SEO分析工具
2.Backlinkwatch.com—反链检测
3.XENU Link Sleuth—死链检测
4.SEO Tool Bar (火狐插件)
5.SEO Quake (火狐插件)
<span style="font-size:18px;"><!– 默认先调用css.css样式表 –> <link rel="stylesheet" type="text/css" href="css.css" /> <!–[if IE 7]> <!– 如果IE浏览器版是7,调用ie7.css样式表 –> <link rel="stylesheet" type="text/css" href="ie7.css" /> <![endif]–> <!–[if lte IE 6]> <!– 如果IE浏览器版本小于等于6,调用ie.css样式表 –> <link rel="stylesheet" type="text/css" href="ie.css" /> <![endif]–></span>
2.在css中用一行css代码实现在不同类型的浏览器(如IE6,IE7,IE8)之间显示出不同的样式
<span style="font-size:18px;">.mycolor{ color:#FFF\9;/*IE6、7、8*/ *color:#FF0;/* IE7、6 */ _color:#F00;/* IE6 */ }</span>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>三栏布局-浮动方法</title> <style type="text/css"> body,div,p{ margin:0; padding:0; } #wrap { padding:0 300px 0 200px; *overflow:hidden; } #main { float:left; width:100%; height:600px; background:#fffaba; } #left, #right { position:relative; height:600px; _display:inline; } #left { width:200px; float:left; margin-left:-100%; right:200px; _right:-300px; background:#8fc41f; } #right { width:300px; float:right; margin-right:-300px; background:#00b7ef; } </style> </head> <body> <span style="white-space:pre"> </span><div id="wrap"> <div id="main"> main </div> <div id="left"> left </div> <div id="right"> right </div> </div> </body> </html>
原文地址:http://blog.csdn.net/u013705728/article/details/45915211