在 JavaScript 中,是否可以对已经声明的变量进行解构?
以下是用 JavaScript 对已声明的变量进行解构的代码 -
示例
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Document</title> <style> body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result { font-size: 18px; font-weight: 500; color: rebeccapurple; } </style> </head> <body> <h1>De-structure to already-declared variables</h1> <div class="result"></div> <br /> <button class="Btn">CLICK HERE</button> <h3>Click on the above button to destructure the personObj object</h3> <script> let resEle = document.querySelector(".result"); let BtnEle = document.querySelector(".Btn"); let name, age, personObj; personObj = { name: "Rohan", age: 19, }; BtnEle.addEventListener("click", () => { ({ name, age } = personObj); resEle.innerHTML = " name = " + name + "<br>age = " + age; }); </script> </body> </html>
输出
以上代码将产生以下输出 -
点击“点击此处”按钮 -
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