alt的的用法

<span alt="我是活雷锋">我是活雷锋</span><br><br><span alt="我是活雷锋" altbg="red" altcolor=yellow altborder="yellow">我是活雷锋</span><br><br><span alt="我是活雷锋" altbg="#F7F7F7" altcolor="#999999" altborder="#CCCCCC">我是活雷锋</span><br><br><span alt="我是活雷锋" altbg="green" altcolor=yellow altborder="darkgreen">我是活雷锋</span><br><br><span alt="我是活雷锋" altbg="#000000" altcolor="#FFFFFF" altborder="#000000">我是活雷锋</span><div style="display:none;border:1px solid #000000;background-color:#FFFFCC;font-size:12px;position:absolute;padding:2;" mce_style="display:none;border:1px solid #000000;background-color:#FFFFCC;font-size:12px;position:absolute;padding:2;" id=altlayer></div><mce:script type="text/javascript"><!--document.body.onmousemove=quickalt;document.body.onmouseover=getalt;document.body.onmouseout=restorealt;var tempalt='';function getalt(){if(event.srcElement.alt && (event.srcElement.alt!='' || (event.srcElement.alt=='' && tempalt!=''))){altlayer.style.left=event.x;altlayer.style.top=event.y+20;altlayer.style.display='';tempalt=event.srcElement.alt;tempbg=event.srcElement.altbg;tempcolor=event.srcElement.altcolor;tempborder=event.srcElement.altborder;event.srcElement.alt='';altlayer.innerText=tempalt;if (typeof(tempbg)!="undefined"){altlayer.style.background=tempbg}else{altlayer.style.background="#FFFFCC"}if (typeof(tempcolor)!="undefined"){altlayer.style.color=tempcolor}else{altlayer.style.color=tempcolor="#000000"}if (typeof(tempborder)!="undefined"){altlayer.style.border='1px solid '+tempborder;}else{altlayer.style.border='1px solid #000000';}}}function quickalt(){if(altlayer.style.display==''){altlayer.style.left=event.x;altlayer.style.top=event.y+10;}}function restorealt(){event.srcElement.alt=tempalt;tempalt='';altlayer.style.display='none';}// --></mce:script> 

 

alt的换行用&#10或者&#13