js获取用户页面复制的内容

document.addEventListener(‘copy‘, function() {
                var content = window.getSelection().toString();
                console.log(content )
})

document.addEventListener(‘keyup‘, function(e) {
                if(e.ctrlKey && e.keyCode == "67") {
                    var content = window.getSelection().toString();                    
                    alert(content)
                }

            })