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<!DOCTYPE html> <html> <body> <h2>JavaScript 数据类型</h2> <p>JavaScript 具有动态类型。 这意味着同一个变量可以用来保存不同的数据类型：</p> <p id="demo"></p> <script> var x; // Now x is undefined x = 5; // Now x is a Number x = "John"; // Now x is a String document.getElementById("demo").innerHTML = x; </script> </body> </html>