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<!DOCTYPE html> <html> <body> <h2>JavaScript 数字方法</h2> <p>valueOf() 方法返回一个数字作为数字：</p> <p id="demo"></p> <script> var x = 123; document.getElementById("demo").innerHTML = x.valueOf() + "<br>" + (123).valueOf() + "<br>" + (100 + 23).valueOf(); </script> </body> </html>