点击按钮实现文本复制功能

function copy(){if (iOS微信端) {var selectedText, element = mui('.myCode')[0];if (element.nodeName === 'INPUT' || element.nodeName === 'TEXTAREA') {var isReadOnly = element.hasAttribute('readonly');if (!isReadOnly) {element.setAttribute('readonly', '');}element.select();element.setSelectionRange(0, element.value.length);if (!isReadOnly) {element.removeAttribute('readonly');}selectedText = element.value;}//判断是否为Uc浏览器var u = navigator.userAgent;if (u.indexOf('Linux') > -1) {app.toast('success');} else {try {if (document.execCommand('copy', false, null)) {app.toast("已复制到剪切板");}} catch (e)