回答怎么将php转成js代码

<?php
$user_agent = $_SERVER['HTTP_USER_AGENT'];
if (strpos($user_agent, 'MicroMessenger') === false) {
// 非微信浏览器禁止浏览
echo "HTTP/1.1 401 Unauthorized";
} else {
// 微信浏览器，允许访问
echo "MicroMessenger";
// 获取版本号
preg_match('/.*?(MicroMessenger\/([0-9.]+))\s*/', $user_agent, $matches);
echo '<br>Version:'.$matches[2];
}

with(navigator){
    if(appName != 'MicroMessenger'){
        document.write('非微信浏览器');
    }else{
        document.write('MicroMessenger</br>'+appVersion);
    }
 
}