标签length长度大于指定值,剩余值以...代替(qtip-JQuery)

标签length长度大于指定值,剩余值以...代替
$(function(){ 
    $(element).each(function(){ 
        var ev= $(this).html(); 
        if(ev.length > 30){ 
            $(this).html(ev.substring(0, 30) + "..."); 
            $(this).qtip({ 
               content: ev, 
               show: 'mouseover', 
               hide: 'mouseout'          
            }); 
        } 
    }); 
});