sap ui5 bootstrap code example

Example: sap ui5 bootstrap script

<script
         id="sap-ui-bootstrap"
         src="/resources/sap-ui-core.js" 
         data-sap-ui-theme="sap_bluecrystal"
         data-sap-ui-libs="sap.m"
         data-sap-ui-compatVersion="edge"
         data-sap-ui-preload="async" >
      </script>
      <script>
         sap.ui.getCore().attachInit(function () {
             alert("UI5 is ready");
         });
      </script>