不能更改< button>的“类型”用Javascript

在Chromium 7.0.517.44（64615）Ubuntu 10.10上，我似乎无法更改< button> 类型 / code>元素：

On Chromium 7.0.517.44 (64615) Ubuntu 10.10, I seem to be unable to change the type attribute of a <button> element:

> blah = document.createElement("button")
  <button>​</button>​
> blah.type
  "submit"
> blah.type = "button"
  "button"
> blah.type
  "submit"

帮助？

在Firefox 3.6.12和Opera 10.63上，可以正常工作：

On Firefox 3.6.12 and Opera 10.63, it works fine:

>>> blah = document.createElement("button")
    <button>
>>> blah.type
    "submit"
>>> blah.type = "button"
    "button"
>>> blah.type
    "button"