判断当前是否为手机端之JS版

<script language="javascript">
	function is_mobile() {
		var regex_match = /(nokia|iphone|iPad|android|motorola|^mot-|softbank|foma|docomo|kddi|up.browser|up.link|htc|dopod|blazer|netfront|helio|hosin|huawei|novarra|CoolPad|webos|techfaith|palmsource|blackberry|alcatel|amoi|ktouch|nexian|samsung|^sam-|s[cg]h|^lge|ericsson|philips|sagem|wellcom|bunjalloo|maui|symbian|smartphone|midp|wap|phone|windows ce|iemobile|^spice|^bird|^zte-|longcos|pantech|gionee|^sie-|portalmmm|jigs browser|hiptop|^benq|haier|^lct|operas*mobi|opera*mini|320x320|240x320|176x220)/i;
		var u = navigator.userAgent;
		if (null == u) {
			return true;
		}
		var result = regex_match.exec(u);

		if (null == result) {
			return false
		} else {
			return true
		}
	}
	if (is_mobile()) {
		document.location.href= 'http://m.baidu.com/';
	}
</script>