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<!DOCTYPE html> <html> <body> <h2>JavaScript <i>this</i> 关键字</h2> <p>在函数中，默认情况下，<b>this</b> 指的是 Global 对象。</p> <p>在严格模式下，<b>this</b>是<b>undefined</b>，因为严格模式不允许默认绑定：</p> <p id="demo"></p> <script> "use strict"; document.getElementById("demo").innerHTML = myFunction(); function myFunction() { return this; } </script> </body> </html>