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JavaScript 异步编程
tryjs_callback7
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<!DOCTYPE html> <html> <body> <h2>JavaScript callback</h2> <p id="demo"></p> <script> function myDisplayer(id, some) { document.getElementById(id).innerHTML = some; } function getFile(file, callback, id) { let xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { callback(id, this.responseText); } } xhttp.open("GET", file, true); xhttp.send(); } getFile("/demo/mycar.html", myDisplayer, "demo"); </script> </body> </html>