使用 for in 访问属性

  1. <!DOCTYPE html>
  2. <html>
  3. <body>
  4.  
  5. <h1>JavaScript 对象属性</h1>
  6.  
  7. <p id="demo"></p>
  8.  
  9. <script>
  10. var txt = "";
  11. var person = {fname:"Bill", lname:"Gates", age:62}; 
  12. var x;
  13. for (x in person) {
  14.   txt += person[x] + " ";
  15. }
  16. document.getElementById("demo").innerHTML = txt;
  17. </script>
  18.  
  19. </body>
  20. </html>