JS实现禁用滑动条但滑动条不消失的效果

//方法

//滑动条

// left: 37, up: 38, right: 39, down: 40,

// spacebar: 32, pageup: 33, pagedown: 34, end: 35, home: 36

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;

}

//判断是否微信浏览器打开

function isWeiXin(){

var ua = window.navigator.userAgent.toLowerCase();

if(ua.match(/MicroMessenger/i) == 'micromessenger'){

return true;

}else{

return false;

}

}

//调用

if(isWeiXin()){

$('body').bind("touchmove",function(e){

e.preventDefault();

});

}else{

disable_scroll();

}

if(isWeiXin()){

$("body").css("overflow-y", "inherit");

$("body").css("position", "inherit");

$("body").unbind("touchmove");

}else{

enable_scroll();

}