解释 JavaScript 中的 “for…in” 语句?
for…in 循环遍历所有对象属性。以下是 JavaScript 中实现 for..in 语句的代码 −
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; } .sample,.result { font-size: 18px; font-weight: 500; color: red; } </style> </head> <body> <h1>"for...in" statement in JavaScript</h1> <div class="sample"> {"firstName":"Rohan","lastName":"Sharma","age":22} </div> <div class="result" style="color: green;"></div> <button class="Btn">CLICK HERE</button> <h3>Click on the above button to traverse the above object using for..in loop</h3> <script> let sampleEle = document.querySelector(".sample"); let resultEle = document.querySelector(".result"); let obj = JSON.parse(sampleEle.innerHTML); document.querySelector(".Btn").addEventListener("click", () => { for (let i in obj) { resultEle.innerHTML += "Property = " + i + " : Value = " + obj[i] + "<br>"; } }); </script> </body> </html>
输出
以上代码将生成以下输出 −
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