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<!DOCTYPE html> <html> <body> <h2>JavaScript 的 For/In 循环</h2> <p>for/in 语句循环遍历对象的属性。</p> <p id="demo"></p> <script> var txt = ""; var person = {fname:"John", lname:"Doe", age:25}; var x; for (x in person) { txt += person[x] + " "; } document.getElementById("demo").innerHTML = txt; </script> </body> </html>