將對象轉為hash對象

Creates a Hash (which is synonymous to "map" or "associative array" for our purposes). A convenience wrapper around the Hash constructor, with a safeguard that lets you pass an existing Hash object and get it back untouched (instead of uselessly cloning it).

The $H function is the shorter way to obtain a hash (prior to 1.5 final, it was the only proper way of getting one).

object.prototype._proto_、?

  1. <!DOCTYPE?html?PUBLIC?"-//W3C//DTD?XHTML?1.0?Transitional//EN"?
  2. ?"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">?
  3. <html>?
  4. ????<head>?
  5. ????????<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8"?/>?
  6. ????????<title>$H</title>?
  7. ????????<script?type="text/javascript"?language="javascript"?
  8. ?????????src="prototype.js"?></script>?
  9. ????????<script>?
  10. ????????function?test()?
  11. ????????{?
  12. ????????????//?創建一個對象,對于像sucre這樣的字符串要記得加引號?
  13. ????????????var?obj?=?{?
  14. ????????????????userName:?'sucre',?
  15. ????????????????password:?'secret',?
  16. ????????????????age:?27?
  17. ????????????????};?
  18. ?????
  19. ????????????//?將其轉換為Hash對象?
  20. ????????????var?hash?=?$H(obj);?
  21. ????????????alert(hash.toQueryString());?
  22. ????????}?
  23. ????????function?getValue(){?
  24. ????????????var?h?=?$H({name:?'sucre',?age:?27,?country:?'China'});?
  25. ????????????//?Equivalent?to:?
  26. ????????????var?hh?=?new?Hash({name:?'sucre',?age:?27,?country:?'China'});?
  27. ????????????//?Can?then?be?accessed?the?classic?Hash?way?
  28. ????????????var?country?=?h.get('country');?
  29. ????????????var?name?=?hh.get('name');?
  30. ????????????//看到了輸出的結果是一樣的，說明$H與new?Hash是一回事?
  31. ????????????alert("h中的country:"+country+"\r\n"+"hh中的name:"+name);?
  32. ????????}?
  33. ????????</script>?
  34. ????</head>?
  35. ????<body>?
  36. ????????<form>?
  37. ????????????<input?type="button"?value="轉換"?onclick="test()"?/>?
  38. ????????????<input?type="button"?value="取值"?onclick="getValue()"?/>?
  39. ????????</form>?
  40. ????</body>?
  41. </html>?
 
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