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function IsNull(){
var str = document.getElementById('str').value.trim();
if(str.length==0){
alert('¶Ô²»Æð£¬Îı¾¿ò²»ÄÜΪ¿Õ»òÕßΪ¿Õ¸ñ!');//Ç뽫“Îı¾¿ò”¸Ä³ÉÄãÐèÒªÑéÖ¤µÄÊôÐÔÃû³Æ!
}
}

//ÅжÏÈÕÆÚÀàÐÍÊÇ·ñΪYYYY-MM-DD¸ñʽµÄÀàÐÍ
function IsDate(){
var str = document.getElementById('str').value.trim();
if(str.length!=0){
var reg = /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/;
var r = str.match(reg);
if(r==null)
alert('¶Ô²»Æð£¬ÄúÊäÈëµÄÈÕÆÚ¸ñʽ²»ÕýÈ·!'); //Ç뽫“ÈÕÆÚ”¸Ä³ÉÄãÐèÒªÑéÖ¤µÄÊôÐÔÃû³Æ!
}
}

//ÅжÏÈÕÆÚÀàÐÍÊÇ·ñΪYYYY-MM-DD hh:mm:ss¸ñʽµÄÀàÐÍ
function IsDateTime(){
var str = document.getElementById('str').value.trim();
if(str.length!=0){
var reg = /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/;
var r = str.match(reg);
if(r==null)
alert('¶Ô²»Æð£¬ÄúÊäÈëµÄÈÕÆÚ¸ñʽ²»ÕýÈ·!'); //Ç뽫“ÈÕÆÚ”¸Ä³ÉÄãÐèÒªÑéÖ¤µÄÊôÐÔÃû³Æ!
}
}

//ÅжÏÈÕÆÚÀàÐÍÊÇ·ñΪhh:mm:ss¸ñʽµÄÀàÐÍ
function IsTime()
{
var str = document.getElementById('str').value.trim();
if(str.length!=0){
reg=/^((20|21|22|23|[0-1]\d)\:[0-5][0-9])(\:[0-5][0-9])?$/
if(!reg.test(str)){
alert("¶Ô²»Æð£¬ÄúÊäÈëµÄÈÕÆÚ¸ñʽ²»ÕýÈ·!");//Ç뽫“ÈÕÆÚ”¸Ä³ÉÄãÐèÒªÑéÖ¤µÄÊôÐÔÃû³Æ!
}
}
}

//ÅжÏÊäÈëµÄ×Ö·ûÊÇ·ñΪӢÎÄ×Öĸ
function IsLetter()
{
var str = document.getElementById('str').value.trim();
if(str.length!=0){
reg=/^[a-zA-Z]+$/;
if(!reg.test(str)){
alert("¶Ô²»Æð£¬ÄúÊäÈëµÄÓ¢ÎÄ×ÖĸÀàÐ͸ñʽ²»ÕýÈ·!");//Ç뽫“Ó¢ÎÄ×ÖĸÀàÐÍ”¸Ä³ÉÄãÐèÒªÑéÖ¤µÄÊôÐÔÃû³Æ!
}
}
}

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