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JavaScript Object Protection 对象保护
tryjs_object_isextensible2
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<!DOCTYPE html> <html> <body> <h1>JavaScript Objects</h1> <h2>The Object.isExtensible() Method</h2> <p id="demo"></p> <script> // Create Array const fruits = ["Banana", "Orange", "Apple", "Mango"]; // Prevent Extensions Object.preventExtensions(fruits); // This will return false let answer = Object.isExtensible(fruits); document.getElementById("demo").innerHTML = answer; </script> </body> </html>