移除部分字串

<html>
<body>

<div id="powenko">hi</div>

<javascript>

var str1='<img style="width: 32px; height: 32px;" src="1.jpg" width="500" height="600" />style="width: 32px; height: 32px;" '
var tStr2='style="'
var tStr3='"'
var n1 = str1.indexOf(tStr2);
if (n1>=0) {
  var n2 = str1.indexOf(tStr3,n1+tStr2.length);
  var str2 = str1.substring(n1, n2+tStr3.length);
  var str3 = str1.replace(str2, "");
  document.getElementById('powenko').innerHTML = n1+","+n2+","+str3;
}
</javascript>
</body>
</html>
JAVASCRIPT
