window.onload=function(){ //设置年份的选择 var myDate= new Date(); var startYear=myDate.getFullYear()-50;//起始年份 var endYear=myDate.getFullYear()+50;//结束年份 var obj=document.getElementById('myYear') for (var i=startYear;i<=endYear;i++) { obj.options.add(new Option(i,i)); } obj.options[obj.options.length-51].selected=1; }