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1.±ÈÈçÎÒÏÖÔÚÏë×öÒ»¸ö·Ç¿ÕÑéÖ¤
function check() {
var str = document.myform.txtUser.value;
//È¡µ½valueÒÔºó½ÓÏÂÀ´ÈçºÎÓÃÕýÔò±í´ïʽÑé֤Ĩ?
}
2.ͬÑùÊÇ×öÒ»¸ö·Ç¿ÕÑéÖ¤, Õâ¸öÓ¦¸Ã²»ÓÃÕýÔò±í´ïʽµÄ°É?
Åжϵ¥Ñ¡°´Å¥(ÄÐÅ®, ±ØÐëҪѡÔñÒ»¸ö)ºÍ¶àÑ¡Ïî¿ò(ÖÁÉÙҪѡÔñÒ»¸ö) ÒÔ¼°ÏÂÀÁбíҪѡÖÐÒ»¸ö, ÈçºÎÑéÖ¤?
function check() {
var str = document.myform.txtUser.value;
//È¡µ½valueÒÔºó½ÓÏÂÀ´ÈçºÎÓÃÕýÔò±í´ïʽÑé֤Ĩ?
if(str.length<1){
alert("Ϊ¿Õ");
return false;//·Ç¿Õ²»ÓÃÕýÔòµÄ
}
}
2,¼ÈȻҪ±ØÐëÑ¡ÖÐÒ»¸ö Ò²²»ÓÃÑéÖ¤ÁË Ö±½ÓĬÈÏÉèÖÃһϠÔÚhtmlÖРд checked »ò selected
ȯaspwebbchh:
1.ÕâÑù²»ºÃ°É, ¸Ð¾õºÍstr == ""Ò»Ñù, Èç¹ûÓû§ÊäÈ뼸¸ö¿Õ¸ñ¾Í±¾ßÁË
2.ÏÖÔÚµÄÇé¿ö¾ÍÊDz»ºÃ¹Ì¶¨checkedµÄÒ»¸ö, ÖÁÉÙcheckbox²»ºÃÓð¡
str=trim(str);ÕâÑù¿Õ¸ñ¾ÍûÊÂÁË
var arr = document.getElementsByName("checkboxname");
var x=0
for(var i=0;i<arr.length;i++){
if(arr[i].checked){
x=x+1
}
}
if(x==0){
alert("±ØÐëѡһ¸ö");
return false;
}
trimÕâ¸ö·½·¨ÊÇ´ÓÄÄÀïÀ´µÄ? ºÃÏñûÓÐѽ
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function ltrim(str){
return str.replace( /^[" "|"¡¡"]*/, "");
}
function rtrim(str){
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