.onload = function()
{
var gaga = document.getElementById( "gaga"
);
addClass( gaga,"gaga1" )
addClass( gaga,"gaxx"
);
removeClass( gaga,"gaga1" )
removeClass( gaga,"gaga" )
function hasClass( elements,cName )
{
return !!element
s.className.match( new RegExp( "(\\s|^)" + cName + "(\\s|$)")
); // ( \\s|^ ) 判断前面是否有空格 (\\s | $ )判断后面是否有空格 两个感叹号为转换为布尔值 以方
便做判断
};
function addClass( elements,cName )
{
if( !hasClass( elements,cName ) )
{
element
s.className += " " + cName;
};
};
function removeClass( elements,cName )
{
if( hasClass( elements,cName ) )
{
element
s.className = element
s.className.
replace( new RegExp( "(\\s|^)" + cName + "(\\s|$)" )," "
); //
replace方法是替换
};
};
};