10/5 复习以前知识

<script language="javascript">
function test11(){
var year1=form1.year.value;
alert(year1);
if((year1%4)==0 && (year1%100)!=0){
alert(year1+"是闰年");
}else{
alert(year1+"不是闰年");
}
}

</script>

复习if语句时出错,少写括号!