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<!DOCTYPE html> <html> <body> <h2>JavaScript "this"</h2> <p>此示例演示在箭头函数中，“this”关键字代表拥有该函数的对象，无论谁调用该函数。</p> <p>点击按钮再次执行“hello”函数，你会看到“this”仍然代表window对象。</p> <button id="btn">单击我！</button> <p id="demo"></p> <script> var hello; hello = () => { document.getElementById("demo").innerHTML += this; } //窗口对象调用函数： window.addEventListener("load", hello); //按钮对象调用函数： document.getElementById("btn").addEventListener("click", hello); </script> </body> </html>