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JavaScript表单验证电话号码

JavaScript表单验证电话号码，判断一个输入量是否为电话号码，通过正则表达式实现。
//检查电话号码
function isTel(str){
   var reg=/^([0-9]|[\-])+$/g ;
   if(str.length<7 || str.length>18){
      return false;
   }
   else{
      return reg.exec(str);
   }
}