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/**//*--------------------------------------------
    ÃèÊö : Ìí¼ÓеÄÑùʽrule
    ²ÎÊý : styleSheetsË÷Òý
    ´úÂë : var ss = new styleSheet(0);
--------------------------------------------*/
var styleSheet = function(n)
...{
    var ss;
    if (typeof n == "number") ss = document.styleSheets[n];
    this.sheet = ss;
    this.rules = ss.cssRules?ss.cssRules:ss.rules;
};
/**//*--------------------------------------------
    ÃèÊö : ²éÕÒÑùʽrule£¬³É¹¦·µ»Øindex,·ñÔò·µ»Ø-1
    ²ÎÊý : nΪruleÃû³Æ
    ´úÂë : var ss = new styleSheet(0);
          ss.indexOf("className")
--------------------------------------------*/
styleSheet.prototype.indexOf = function(selector)
...{
    for(var i=0;i<this.rules.length;i++)
    ...{
        if(this.rules[i].selectorText==selector)
        ...{
            return i;
        }
    }
    return -1;
};
/**//*--------------------------------------------
    ÃèÊö : É¾³ýÑùʽrule
    ²ÎÊý : nΪruleË÷Òý»òÕßÃû³Æ
    ´úÂë : var ss = new styleSheet(0);
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