用户点击鼠标右键时触发并打开上下文菜单
禁用：
document.oncontextmenu = function() {
return false;
}
编辑自定义右键打开菜单
document.oncontextmenu = function() {
return false;
}
document.body.addEventListener('mousedown',function(e){
switch(e.button) {
case 0:
console.log("鼠标左键")
break;
case 1:
console.log("鼠标中间");
break;
case 2:
document.getElementById('custom-menu').style.display = 'block'
console.log("鼠标右键");
break;
default:
break;
}
})
