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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);
}
}
