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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?
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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

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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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