简单原理：

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document.createElement("textarea");
textArea.value = text;
textArea.select();
document.execCommand('copy');
document.body.removeChild(textArea);

具体代码：

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function copyToClipboard (text) {
    if(text.indexOf('-') !== -1) {
        let arr = text.split('-');
        text = arr[0] + arr[1];
    }
    var textArea = document.createElement("textarea");
      textArea.style.position = 'fixed';
      textArea.style.top = '0';
      textArea.style.left = '0';
      textArea.style.width = '2em';
      textArea.style.height = '2em';
      textArea.style.padding = '0';
      textArea.style.border = 'none';
      textArea.style.outline = 'none';
      textArea.style.boxShadow = 'none';
      textArea.style.background = 'transparent';
      textArea.value = text;
      document.body.appendChild(textArea);
      textArea.select();

      try {
        var successful = document.execCommand('copy');
        var msg = successful ? '成功复制到剪贴板' : '该浏览器不支持点击复制到剪贴板';
       alert(msg);
      } catch (err) {
        alert('该浏览器不支持点击复制到剪贴板');
      }

      document.body.removeChild(textArea);
}