我正在尝试创建一个发送文本消息的按钮。我被赋予了代码，我只是不知道该怎么处理它。请帮忙！

iPhone

href = "sms://+15558675309/&body=TextHere"

Android系统

href = "sms://+15558675309/?body=TextHere"

如果你想知道，“我怎样才能确定他们使用的是iPhone还是Android？”

给你：

function getMobileOperatingSystem() {
  var userAgent = navigator.userAgent || navigator.vendor || window.opera;

    if ( userAgent.match( /iPad/i ) || userAgent.match( /iPhone/i ) || userAgent.match( /iPod/i ) ) { return \'iOS\'; }

    else if ( userAgent.match( /Android/i ) ) { return \'Android\'; }

    else { return \'unknown\'; }
}
Then you can wrap the above SMS syntax like this:

var message_text = \'Pre-filled message goes here\'

if (device == \'iOS\') {
 href = "sms://+15558675309/&body=" + encodeURI(message_text);
} 

if (device == \'Android\') {
 href = "sms://+15558675309/?body=" + encodeURI(message_text);
}

<script>
function getMobileOperatingSystem() {
  var userAgent = navigator.userAgent || navigator.vendor || window.opera;

    if ( userAgent.match( /iPad/i ) || userAgent.match( /iPhone/i ) || userAgent.match( /iPod/i ) ) { return \'iOS\'; }

    else if ( userAgent.match( /Android/i ) ) { return \'Android\'; }

    else { return \'unknown\'; }
}

var message_text = \'Pre-filled message goes here\'
if (device == \'iOS\') {
 href = "sms://+15558675309/&body=" + encodeURI(message_text);
} else {
 href = "sms://+15558675309/?body=" + encodeURI(message_text);}

document.getElementById("myElement").innerHTML = \'<button onclick="window.open(\' + href + \');">Click me!</button>\';
</script>