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<!DOCTYPE html> <html> <body> <p>如何遍历 JSON 对象中的所有属性。</p> <p id="demo"></p> <script> var myObj, x; myObj = {"name":"John", "age":30, "car":null}; for (x in myObj) { document.getElementById("demo").innerHTML += x + "<br>"; } </script> </body> </html>