beijixingtianyake的专栏

var a=null; var b=""; var c=0; var d=" "; var e; alert(typeof a); alert(typeof b); alert(typeof c); alert(typeof d); alert(typeof e); if(!a){ alert("a is null"); }else{ alert("a is no

function addDay(millsSeconds, value) {             var date = new Date();             if (millsSeconds > 0) {                 date.setTime(millsSeconds);             }             var oneDayM