被字符串除的数不再是数被字符串除的数不再是数<!DOCTYPE html><html><body> <h1>JavaScript 数字</h1> <p>用非数字字符串进行除法会得到 NaN(Not a Number):</p> <p id="demo"></p> <script>document.getElementById("demo").innerHTML = 100 / "Apple";</script> </body></html>