屏蔽选中

/** *  屏蔽选中*/      document.onselectstart = function (event) {        if (window.event) {            event = window.event;        }        try {            var the = event.srcElement;            if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")) {                return false;            }            return true;        } catch (e) {            return false;        }    }