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<!DOCTYPE html> <html> <body> <h2>全局“严格模式”声明。</h2> <p>在浏览器中激活调试 (F12) 以查看错误报告。</p> <script> "use strict"; myFunction(); function myFunction() { y = 3.14; // 这会导致错误(y is not defined) } </script> </body> </html>