1.禁止右键菜单

document.addEventListener("contextmenu", function (e) {
            e.preventDefault();
        });

2. 禁止选中

document.addEventListener("selectstart", function (e) {
            e.preventDefault();
        })

3. 双击禁止选中文字

window.getSelection ? window.getSelection().removeAllRanges() :  document.selection.empty();