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JavaScript Object.preventExtensions() 方法
tryjsref_object_preventextensions2
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<!DOCTYPE html> <html> <body> <h1>JavaScript Objects</h1> <h2>The Object.preventExtensions() Method</h2> <p id="demo"></p> <script> const fruits = ["Banana", "Orange", "Apple", "Mango"]; Object.preventExtensions(fruits); // Test Error let text = ""; try { fruits.push("Kiwi"); } catch (err) { text = err; } document.getElementById("demo").innerHTML = text; </script> </body> </html>