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<!DOCTYPE html> <html> <body> <h2>JavaScript 数字方法</h2> <p>如果参数是整数，则 isInteger() 方法返回 true。</p> <p>否则它返回 false。</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = Number.isInteger(10) + "<br>" + Number.isInteger(10.5); </script> </body> </html>