javascript 实现禁用浏览器放大缩小

	<script language="javascript">
        var scrollFunc = function (e) {
            e = e || window.event;
            if (e.wheelDelta && event.ctrlKey) {//IE/Opera/Chrome
                event.returnValue = false;
            } else if (e.detail) {//Firefox
                event.returnValue = false;
            }
        }
        /*注册事件*/
        if (document.addEventListener) {
            document.addEventListener('DOMMouseScroll', scrollFunc, false);
        }//W3C
        window.onmousewheel = document.onmousewheel = scrollFunc;//IE/Opera/Chrome/Safari
    </script>