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<!DOCTYPE html> <html> <body> <h2>JavaScript let</h2> <p>在程序中的任何地方都允许使用 <b>var</b> 重新声明 JavaScript 变量：</p> <p id="demo"></p> <script> var x = 2; // Now x is 2 var x = 3; // Now x is 3 document.getElementById("demo").innerHTML = x; </script> </body> </html>