剪切板 ​

function copy(dom) {
  dom.select()
  document.execCommand('copy')
  console.log('已复制')
}

function paste(dom) {
  dom.focus()  // 输入框元素
  document.execCommand(paste'')
}

function writeToClipboard(text) {
  try {
    navigator.clipboard
      .writeText(text)
      .then(() => console.log("success"))
      .catch(() => console.log("failure"));
  } catch (err) {}
}