复制内容到剪切板

(function() {
        var textarea = document.createElement(‘textarea‘);
        textarea.id = ‘text‘;
        textarea.innerHTML = Math.round(Math.random() * 100);
        textarea.style.opacity = 0;
        document.body.appendChild(textarea);
        document.onclick = function() {
            var text = document.getElementById("text");
            text.select();
            document.execCommand("Copy");
        }
    })();