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<!DOCTYPE html> <html> <body> <h1>JavaScript 数字</h1> <h2>Number.isSafeInteger() 方法</h2> <p>如果值是安全整数且数据类型为 Number，则 Number.isSafeInteger() 返回 true：</p> <p id="demo"></p> <p>Internet Explorer 11 或更早版本不支持 Number.isSafeInteger()。</p> <script> let result = "Is 5-2 a safe integer? " + Number.isSafeInteger(5-2) + "<br>" + "Is 0 a safe integer? " + Number.isSafeInteger(0) + "<br>" + "Is 0.5 a safe integer? " + Number.isSafeInteger(0.5) + "<br>" + "Is 0/0 a safe integer? " + Number.isSafeInteger(0/0); document.getElementById("demo").innerHTML = result; </script> </body> </html>