js判断表单

//去空 function trim(str) { return str.replace(/(^\s*)|(\s*$)/,""); } //判断是InString中的字符是否在RefString中 function isNumberString(InString,RefString) { if(InString.length==0) return false; for (Count=0; Count < InString.length; Count++) { TempChar=InString.substring (Count, Count+1); if (RefString.indexOf (TempChar, 0)==-1) return false; } return true; } //判断是否是数字 function isNumber(InString) { return isNumberString(InString,"1234567890"); } //判断是否是小写字母 function isSmallletter(InString) { return isNumberString(InString,"abcdefghijklmnopqrstuvwxyz"); } //判断是否是大写字母 function isMajuscule(InString) { return isNumberString(InString,"ABCDEFGHIJKLMNOPQRSTUVWXYZ"); } //判断是否单选被选中 function isRadioChecked(objname) { var obj = document.getElementsByName(""+objname+""); var num = -1; for(i=0;i<obj.length;i++) { if(obj[i].checked) num = i+1; } return num; }