解除网页复制限制

// 解除选择限制
document.body.style.userSelect = "auto";
document.body.style.webkitUserSelect = "auto";
document.body.style.MozUserSelect = "auto";

// 允许右键和复制
document.oncontextmenu = null;
document.onselectstart = null;
document.oncopy = null;

console.log("复制限制已解除！");