//开启背景图片在浏览器中的缓存
try {
	document.execCommand("BackgroundImageCache",false,true);
}
catch (e) {
}
//容错代码
function killErrors() {
return true;
}
window.onerror = killErrors;

function clock(){
	now = new Date(),hour = now.getHours()
	if(hour < 6){document.write("凌晨好!")}
	else if (hour < 9){document.write("早上好!")}
	else if (hour < 12){document.write("上午好!")}
	else if (hour < 14){document.write("中午好!")}
	else if (hour < 17){document.write("下午好!")}
	else if (hour < 19){document.write("傍晚好!")}
	else if (hour < 22){document.write("晚上好!")}
	else {document.write("夜里好!")}
}