jq禁止与启动滚动条

	$(".buy_btn").click(function(){
		$(".pop").fadeIn(300);
		disable_scroll();
		
	});

	$("input[name=‘cancel‘]").click(function(){
		$(".pop").fadeOut(300);
		enable_scroll();
	});





var keys = [37, 38, 39, 40];
function preventDefault(e) {
  e = e || window.event;
  if (e.preventDefault)
      e.preventDefault();
  e.returnValue = false;  
}

function keydown(e) {
    for (var i = keys.length; i--;) {
        if (e.keyCode === keys[i]) {
            preventDefault(e);
            return;
        }
    }
}

function wheel(e) {
  preventDefault(e);
}

function disable_scroll() {
  if (window.addEventListener) {
      window.addEventListener(‘DOMMouseScroll‘, wheel, false);
  }
  window.onmousewheel = document.onmousewheel = wheel;
  document.onkeydown = keydown;
}

function enable_scroll() {
    if (window.removeEventListener) {
        window.removeEventListener(‘DOMMouseScroll‘, wheel, false);
    }
    window.onmousewheel = document.onmousewheel = document.onkeydown = null;  
}

	$(".buy_btn").click(function(){
		$(".pop").fadeIn(300);
		disableScroll();
		
	});

	$("input[name=‘cancel‘]").click(function(){
		$(".pop").fadeOut(300);
		enableScroll()
	});




　　　　var keys = { 37: 1, 38: 1, 39: 1, 40: 1 };

        function preventDefault(e) {
            e = e || window.event;
            if (e.preventDefault)
                e.preventDefault();
            e.returnValue = false;
        }

        function preventDefaultForScrollKeys(e) {
            if (keys[e.keyCode]) {
                preventDefault(e);
                return false;
            }
        }
        var oldonwheel, oldonmousewheel1, oldonmousewheel2, oldontouchmove, oldonkeydown
        , isDisabled;
        function disableScroll() {
            if (window.addEventListener) // older FF
                window.addEventListener(‘DOMMouseScroll‘, preventDefault, false);
            oldonwheel = window.onwheel;
            window.onwheel = preventDefault; // modern standard

            oldonmousewheel1 = window.onmousewheel;
            window.onmousewheel = preventDefault; // older browsers, IE
            oldonmousewheel2 = document.onmousewheel;
            document.onmousewheel = preventDefault; // older browsers, IE

            oldontouchmove = window.ontouchmove;
            window.ontouchmove = preventDefault; // mobile

            oldonkeydown = document.onkeydown;
            document.onkeydown = preventDefaultForScrollKeys;
            isDisabled = true;
        }

        function enableScroll() {
            if (!isDisabled) return;
            if (window.removeEventListener)
                window.removeEventListener(‘DOMMouseScroll‘, preventDefault, false);

            window.onwheel = oldonwheel; // modern standard

            window.onmousewheel = oldonmousewheel1; // older browsers, IE
            document.onmousewheel = oldonmousewheel2; // older browsers, IE

            window.ontouchmove = oldontouchmove; // mobile

            document.onkeydown = oldonkeydown;
            isDisabled = false;
        }
        window.scrollHanlder = {
            disableScroll: disableScroll,
            enableScroll: enableScroll
        };