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<!DOCTYPE html> <html> <body> <h1>JavaScript 回调</h1> <p id="demo"></p> <script> function myDisplayer(some) { document.getElementById("demo").innerHTML = some; } function getFile(myCallback) { let req = new XMLHttpRequest(); req.open('GET', "/demo/js/mycar.html"); req.onload = function() { if (req.status == 200) { myCallback(this.responseText); } else { myCallback("Error: " + req.status); } } req.send(); } getFile(myDisplayer); </script> </body> </html>