JS屏蔽右键菜单，复制，粘帖xxxxx........

//屏蔽右键菜单
    document.oncontextmenu = 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;
        }
    }

    //屏蔽粘贴
    document.onpaste = 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;
        }
    }

    //屏蔽复制
    document.oncopy = 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;
        }
    }

    //屏蔽剪切
    document.oncut = 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;
        }
    }

    //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;
        }
    }