【www.bbyears.com--正则表达式】
javascript教程 电话号码验证
下面的检查功能，如果电话号码是有效的。起初我们使用正则表达式和替换（）方法
来清除任何间隔字符。下一步，我们使用isNaN（）函数来检查的电话号码只包含数字
。最后我们检查字符串的长度和许可证，只有10个数字的电话号码。
function validatePhone(fld) {
var error = "";
var stripped = fld.value.replace(/[().- ]/g, "");
if (fld.value == "") {
error = "You didn"t enter a phone number.n";
fld.style.background = "Yellow";
} else if (isNaN(parseInt(stripped))) {
error = "The phone number contains illegal characters.n";
fld.style.background = "Yellow";
} else if (!(stripped.length == 10)) {
error = "The phone number is the wrong length. Make sure you
included an area code.n";
fld.style.background = "Yellow";
}
return
error;
}