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function changeTwoDecimal(x)  
{  
var f_x = parseFloat(x);  
if (isNaN(f_x))  
{  
alert('function:changeTwoDecimal->parameter error');  
return false;  
}  
var f_x = Math.round(x*100)/100;  
  
return f_x;  
}  
  
功能：将浮点数四舍五入，取小数点后2位  
  
用法：changeTwoDecimal(3.1415926) 返回 3.14  
  
changeTwoDecimal(3.1475926) 返回 3.15  
  
js保留2位小数（强制）  
  
对于小数点位数大于2位的，用上面的函数没问题，但是如果小于2位的，比如：  
  
changeTwoDecimal(3.1)，将返回 3.1，如果你一定需要3.10这样的格式，那么需要下面的这个函数：  
  
function changeTwoDecimal_f(x)  
{  
var f_x = parseFloat(x);  
if (isNaN(f_x))  
{  
alert('function:changeTwoDecimal->parameter error');  
return false;  
}  
var f_x = Math.round(x*100)/100;  
var s_x = f_x.toString();  
var pos_decimal = s_x.indexOf('.');  
if (pos_decimal < 0)  
{  
pos_decimal = s_x.length;  
s_x += '.';  
}  
while (s_x.length <= pos_decimal + 2)  
{  
s_x += '0';  
}  
return s_x;  
}  

<?php
$jsapi_ticket=get_jsapi_ticket();
//$access_token=get_access_token();
$appinfo=get_token_appinfo();
require_once "jssdk.php";
$jssdk = new JSSDK($appinfo['appid'],$appinfo['secret'],$access_token=0,$jsapi_ticket);
$signPackage = $jssdk->GetSignPackage();
//dump($signPackage);
?>

  

<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
<script>
  /*
   * 注意：
   * 1. 所有的JS接口只能在公众号绑定的域名下调用，公众号开发者需要先登录微信公众平台进入“公众号设置”的“功能设置”里填写“JS接口安全域名”。
   * 2. 如果发现在 Android 不能分享自定义内容，请到官网下载最新的包覆盖安装，Android 自定义分享接口需升级至 6.0.2.58 版本及以上。
   * 3. 常见问题及完整 JS-SDK 文档地址：http://mp.weixin.qq.com/wiki/7/aaa137b55fb2e0456bf8dd9148dd613f.html
   *
   * 开发中遇到问题详见文档“附录5-常见错误及解决办法”解决，如仍未能解决可通过以下渠道反馈：
   * 邮箱地址：weixin-open@qq.com
   * 邮件主题：【微信JS-SDK反馈】具体问题
   * 邮件内容说明：用简明的语言描述问题所在，并交代清楚遇到该问题的场景，可附上截屏图片，微信团队会尽快处理你的反馈。
   */
   //console.log('fdasfdas');
  wx.config({
    /*debug: true,*/
    appId: '<?php echo $signPackage["appId"];?>',
    timestamp: <?php echo $signPackage["timestamp"];?>,
    nonceStr: '<?php echo $signPackage["nonceStr"];?>',
    signature: '<?php echo $signPackage["signature"];?>',
    jsApiList: [
      // 所有要调用的 API 都要加到这个列表中
	  'onMenuShareTimeline',
	  'onMenuShareAppMessage',
	  'onMenuShareQQ',
	  'onMenuShareWeibo',
	  'onMenuShareQZone'
    ]
  });
  wx.ready(function () {
    // 在这里调用 API
		wx.onMenuShareTimeline({
			imgUrl: 'http://***lizhenqiu.com/222.jpg'
		});
		wx.onMenuShareAppMessage({
			desc: '地址：<?php echo $config['xl_dz'];?>\n电话：<?php echo $config['xl_man'];?>', // 分享描述
			imgUrl: 'http://***lizhenqiu.com/222.jpg'
		});
		wx.onMenuShareQQ({
			desc: '地址：<?php echo $config['xl_dz'];?>\n电话：<?php echo $config['xl_man'];?>', // 分享描述
			imgUrl: 'http://***lizhenqiu.com/222.jpg'
		});
		wx.onMenuShareWeibo({
			desc: '地址：<?php echo $config['xl_dz'];?>\n电话：<?php echo $config['xl_man'];?>', // 分享描述
			imgUrl: 'http://***lizhenqiu.com/222.jpg'
		});
		wx.onMenuShareQZone({
			desc: '地址：<?php echo $config['xl_dz'];?>\n电话：<?php echo $config['xl_man'];?>', // 分享描述
			imgUrl: 'http://***lizhenqiu.com/222.jpg'
		});
  });
</script>

// 判断公众号的类型：是订阅号还是服务号
function get_token_type($token = '') {
	$info = get_token_appinfo ( $token );
	return intval ( $info ['type'] );
}

// 获取jsapi_ticket，自动带缓存功能
function get_jsapi_ticket($token = '') {
	empty ( $token ) && $token = get_token ();
	$key = 'jsapi_ticket_' . $token;
	$res = S ( $key );
	if ($res !== false)
		return $res;
	
	$info = get_token_appinfo ( $token );
	if (empty ( $info ['appid'] ) || empty ( $info ['secret'] )) {
		S ( $key, 0, 7200 );
		return 0;
	}
		$accessToken=get_access_token();
		$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";

	$tempArr = json_decode ( file_get_contents ( $url ), true );
	//dump($tempArr);exit;
	if (@array_key_exists ( 'ticket', $tempArr )) {
		S ( $key, $tempArr ['ticket'], 7200 );
		return $tempArr ['ticket'];
	} else {
		return 0;
	}
}



// 获取access_token，自动带缓存功能
function get_access_token($token = '') {
	empty ( $token ) && $token = get_token ();
	$key = 'access_token_' . $token;
	$res = S ( $key );
	if ($res !== false)
		return $res;
	
	$info = get_token_appinfo ( $token );
	if (empty ( $info ['appid'] ) || empty ( $info ['secret'] )) {
		S ( $key, 0, 7200 );
		return 0;
	}
	
	$url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=' . $info ['appid'] . '&secret=' . $info ['secret'];
	
	      // 如果是企业号用以下URL获取access_token
      
	//if(intval ( $info ['type'] )==1) $url = 'https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=' . $info ['appid'] . '&corpsecret=' . $info ['secret'];
	
	$tempArr = json_decode ( file_get_contents ( $url ), true );
	
	if (@array_key_exists ( 'access_token', $tempArr )) {
		S ( $key, $tempArr ['access_token'], 7200 );
		return $tempArr ['access_token'];
	} else {
		return 0;
	}
}

<?php
class JSSDK {
  private $appId;
  private $appSecret;
  private $access_token;
  private $jsapi_ticket;

  public function __construct($appId, $appSecret,$access_token,$jsapi_ticket) {
    $this->appId = $appId;
    $this->appSecret = $appSecret;
    $this->access_token = $access_token;
    $this->jsapi_ticket = $jsapi_ticket;
  }

  public function getSignPackage() {
    $jsapiTicket = $this->jsapi_ticket;//$this->getJsApiTicket();

    // 注意 URL 一定要动态获取，不能 hardcode.
    $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
    $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

    $timestamp = time();
    $nonceStr = $this->createNonceStr();

    // 这里参数的顺序要按照 key 值 ASCII 码升序排序
    $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";

    $signature = sha1($string);

    $signPackage = array(
      "appId"     => $this->appId,
      "nonceStr"  => $nonceStr,
      "timestamp" => $timestamp,
      "url"       => $url,
      "signature" => $signature,
      "rawString" => $string
    );
    return $signPackage; 
  }

  private function createNonceStr($length = 16) {
    $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    $str = "";
    for ($i = 0; $i < $length; $i++) {
      $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $str;
  }

  private function getJsApiTicket() {
	return $this->jsapi_ticket;
	  
    // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
    $data = json_decode($this->get_php_file("jsapi_ticket.php"));
    if ($data->expire_time < time()) {
      $accessToken = $this->getAccessToken();
      // 如果是企业号用以下 URL 获取 ticket
      $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
      //$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
      $res = json_decode($this->httpGet($url));
      $ticket = $res->ticket;
      if ($ticket) {
        $data->expire_time = time() + 7000;
        $data->jsapi_ticket = $ticket;
        $this->set_php_file("jsapi_ticket.php", json_encode($data));
      }
    } else {
      $ticket = $data->jsapi_ticket;
    }

    return $ticket;
  }

  private function getAccessToken() {
	return $this->access_token;
	  
    // access_token 应该全局存储与更新，以下代码以写入到文件中做示例
    $data = json_decode($this->get_php_file("access_token.php"));
    if ($data->expire_time < time()) {
      // 如果是企业号用以下URL获取access_token
      $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
      //$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
      $res = json_decode($this->httpGet($url));
      $access_token = $res->access_token;
      if ($access_token) {
        $data->expire_time = time() + 7000;
        $data->access_token = $access_token;
        $this->set_php_file("access_token.php", json_encode($data));
      }
    } else {
      $access_token = $data->access_token;
    }
    return $access_token;
  }

  private function httpGet($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_TIMEOUT, 500);
    // 为保证第三方服务器与微信服务器之间数据传输的安全性，所有微信接口采用https方式调用，必须使用下面2行代码打开ssl安全校验。
    // 如果在部署过程中代码在此处验证失败，请到 http://curl.haxx.se/ca/cacert.pem 下载新的证书判别文件。
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
    curl_setopt($curl, CURLOPT_URL, $url);

    $res = curl_exec($curl);
    curl_close($curl);

    return $res;
  }

  private function get_php_file($filename) {
    return trim(substr(file_get_contents($filename), 15));
  }
  private function set_php_file($filename, $content) {
    $fp = fopen($filename, "w");
    fwrite($fp, "<?php exit();?>" . $content);
    fclose($fp);
  }
}