<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
function clock() {
var time=new Date();
var scconds=time.getSeconds();
var hours=time.getHours();
var month=time.getMonth();
var day=time.getDay();
var year=time.getFullYear();
var minute=time.getMinutes();
cu=year+"年"+month+"月"+day+"日"+hours+"小时"+minute
+"分"+scconds+"秒";
document.getElementById("demo").innerHTML=cu;
}
var time1=setInterval(clock,1000);
</script>
</head>
<body>
<div id="demo"></div>
</body>
</html>
8.省市联动
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
var province =new Array();
province[0]="辽宁省";
province[1]="吉林省";
province[2]="黑龙江省"
var len=province.length;
var citys=new Array();
citys[0]=new Array();
citys[1]=new Array();
citys[2]=new Array();
citys[0][0]="沈阳市";
citys[0][1]="抚顺市";
citys[0][2]="本溪市";
citys[0][3]="辽阳市";
citys[0][4]="鞍山市";
citys[1][0]="吉林市";
citys[1][1]="四平市";
citys[1][2]="松源市";
citys[1][3]="长春市";
function showCity() {
var province=document.getElementById("pro01");
var index=province.selectdeIndex-1;
var city=document.getElementById("city");
city.options.length=0;
for(var j=0;j<citys[index].length;j++){
city.options.add(new Option(citys[index][j],index));
}
}
</script>
</head>
<body>
省份:<select id="pro01" onchange="showCity()">
<option value="">请选择省份</option>
<script>
for(var i=0;i<len;i++){
document.write("<option value="+i+">"+province[i]+"</option> ");
}
</script>
</select>
城市:<select name="city" id="city">
<option value="0">请选择城市</option>
</select>
</body>
</html>