具体代码如下所示：

<script language="JavaScript"> function checkid(iden,year,month,day){ if (iden.value.length==15) { if ((iden.value.lastIndexOf(month.value+day.value))==8) { return true; } return false; } if (iden.value.length==18) { if ((iden.value.indexOf(year.value+month.value+day.value))==6) { return true; } return false; } return false; } function isCharsInBag (s, bag) { var i; for (i = 0; i < s.length; i++) { var c = s.charAt(i); if (bag.indexOf(c) == -1) return false; } return true; } function isEmpty(s) { return ((s == null) || (s.length == 0)) } function isWhitespace (s) { var whitespace = " \t\n\r"; var i; for (i = 0; i < s.length; i++) { var c = s.charAt(i); if (whitespace.indexOf(c) >= 0) { return true; } } return false; } function isEmail (s,t) { if (isEmpty(s)) { window.alert("输入的E-mail地址不能为空，请输入！"); mobj = eval(t); mobj.focus(); mobj.select(); return false } if (isWhitespace(s)) { window.alert("输入的E-mail地址中不能包含空格符，请重新输入！"); mobj = eval(t) mobj.focus() mobj.select() return false; } var i = 1; var len = s.length; if (len > 50) { window.alert("email地址长度不能超过50位!"); mobj = eval(t) mobj.focus() mobj.select() return false; } pos1 = s.indexOf("@"); pos2 = s.indexOf("."); pos3 = s.lastIndexOf("@"); pos4 = s.lastIndexOf("."); if ((pos1 <= 0)||(pos1 == len)||(pos2 <= 0)||(pos2 == len)) { window.alert("请输入有效的E-mail地址！"); mobj = eval(t) mobj.focus() mobj.select() return false; } else { if( (pos1 == pos2 - 1) || (pos1 == pos2 + 1) || ( pos1 != pos3 ) || ( pos4 < pos3 ) ) { window.alert("请输入有效的E-mail地址！"); mobj = eval(t) mobj.focus() mobj.select() return false; } } if ( !isCharsInBag( s, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.-_@")) { window.alert("email地址中只能包含字符ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.-_@\n" + "请重新输入" ); mobj = eval(t) mobj.focus() return false; } return true; } function isnumber(str){ var digits="1234567890"; var i=0; var strlen=str.length; while((i<strlen)){ var char=str.charAt(i); if(digits.indexOf(char)==-1)return false;i++; } return true; } function isnumbercode(str){ var digits="1234567890-/"; var i=0; var strlen=str.length; while((i<strlen)){ var char=str.charAt(i); if(digits.indexOf(char)==-1)return false;i++; } return true; } </script> <script language=javascript> function checkForm(theform){ if (document.frm.companyname.value.length==0){ alert("单位名称不能为空。"); mobj = eval("document.frm.companyname"); mobj.focus() mobj.select() return false; } if (document.frm.address.value.length==0){ alert("单位地址不能为空"); mobj = eval("document.frm.address"); mobj.focus() mobj.select() return false; } if (document.frm.invest.value.length==0){ alert("投资额不能为空"); mobj = eval("document.frm.invest"); mobj.focus() mobj.select() return false; } if (document.frm.codeornumber.value.length==0){ alert("法人代码证书号或营业执照编号不能为空"); mobj = eval("document.frm.codeornumber"); mobj.focus() mobj.select() return false; } if (document.frm.linkman.value.length==0){ alert("联系人不能为空"); mobj = eval("document.frm.linkman"); mobj.focus() mobj.select() return false; } if (document.frm.linkmanjob.value.length==0){ alert("联系人职位不能为空"); mobj = eval("document.frm.linkmanjob"); mobj.focus() mobj.select() return false; } if (document.frm.phone.value.length==0){ alert("电话不能为空"); mobj = eval("document.frm.phone"); mobj.focus() mobj.select() return false; } if (document.frm.email.value=='') { window.alert ("请输入您的E-mail地址 ！") mobj = eval("document.frm.email"); mobj.focus() mobj.select() return false } if ( !isEmail(document.frm.email.value,document.frm.email) ) return false if (document.frm.introduction.value.length==0){ alert("公司简介不能为空"); mobj = eval("document.frm.introduction"); mobj.focus() mobj.select() return false; } if (document.frm.positionname.value.length==0){ alert("职位名称不能为空"); mobj = eval("document.frm.positionname"); mobj.focus() mobj.select() return false; } if (document.frm.jobaddress.value.length==0){ alert("工作地点不能为空"); mobj = eval("document.frm.jobaddress"); mobj.focus() mobj.select() return false; } if (document.frm.jobfunction.value.length==0){ alert("工作职责不能为空"); mobj = eval("document.frm.jobfunction"); mobj.focus() mobj.select() return false; } if (document.frm.positionrequre.value.length==0){ alert("职位要求不能为空"); mobj = eval("document.frm.positionrequre"); mobj.focus() mobj.select() return false; } if (document.frm.salary.value.length==0){ alert("待遇不能为空"); mobj = eval("document.frm.salary"); mobj.focus() mobj.select() return false; } } </script> JS代码判断集锦（之二） 12345下一页阅读全文