源代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>享学课堂</title> </head> <body> <p>这个“自制”函数，当用于数组时，返回 true.</p> <p id="demo"></p> <script> var fruits = ["Banana", "Orange", "Apple", "Mango"]; document.getElementById("demo").innerHTML = isArray(fruits); function isArray(x) { return x.constructor.toString().indexOf("Array") > -1; } </script> </body> </html>
运行结果