var $ = function(el){
return (typeof el == 'object')?el:document.getElementById(el);
};
var $A = function(el){
return (typeof el == 'object')?el:document.all(el); //IE Only && 仅IE支持
};
var $C = function(el){
return document.createElement(el);
};
var $N = function(el){
return (typeof el == 'string')?document.getElementsByTagName(el):null;
};
就是定义一函数,然后用的时候方便
return (typeof el == 'object')?el:document.getElementById(el);
};
var $A = function(el){
return (typeof el == 'object')?el:document.all(el); //IE Only && 仅IE支持
};
var $C = function(el){
return document.createElement(el);
};
var $N = function(el){
return (typeof el == 'string')?document.getElementsByTagName(el):null;
};
就是定义一函数,然后用的时候方便
return document.getElementsByTagName(tagName);
} 等于
var $(){
return document.getElementsByTagName(tagName);
}等于
function bb(){
return document.getElementsByTagName(tagName);
}
<input type="text" name="aa" >alert($("aa").value)
alert(bb("aa").value)
,边界的标示方式。这里有一组 javascript的正则表达式的文章,有兴趣可以去看看!
http://www.java2000.net/viewthread.jsp?tid=729
http://www.java2000.net/viewthread.jsp?tid=730
http://www.java2000.net/viewthread.jsp?tid=731
http://www.java2000.net/viewthread.jsp?tid=732
http://www.java2000.net/viewthread.jsp?tid=733
http://www.java2000.net/viewthread.jsp?tid=734
http://www.java2000.net/viewthread.jsp?tid=735
http://www.java2000.net/viewthread.jsp?tid=736
http://www.java2000.net/viewthread.jsp?tid=737
http://www.java2000.net/viewthread.jsp?tid=738
http://www.java2000.net/viewthread.jsp?tid=739