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JavaScript Object.isSealed() 方法
tryjsref_object_issealed
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<!DOCTYPE html> <html> <body> <h1>JavaScript Objects</h1> <h2>The Object.isSealed() Method</h2> <p id="demo"></p> <script> // Create Object const person = {firstName:"John", lastName:"Doe"}; // Seal Object Object.seal(person); // This will return true let answer = Object.isSealed(person) document.getElementById("demo").innerHTML = answer; </script> </body> </html>