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substring 取得部分字串

<html>
<body>
 
<div id="powenko"></div>

</body>
</html>







var str1='<img style="width: 32px; height: 32px;" src="img_girl.jpg" width="500" height="600" />'
var tStr2='style="'
var n1 = str1.indexOf(tStr2);
var n2 = str1.indexOf('"',n1+tStr2.length);
var res = str1.substring(n1, n2+1);
document.getElementById('powenko').innerHTML = n1+","+n2+","+res;