复制步骤

1.选中文本

select()只对<input>和<textarea>无效，所以要获取到点击的值，放到input标签或textarea标签中，再选中复制

2.执行复制命令

document.execCommand("Copy");

复制栗子

input标签实现复制

const selectInputText = (textbox, startIndex, stopIndex) => {  if (textbox.createTextRange) {    const range = textbox.createTextRange();    range.collapse(true);    range.moveStart('character', startIndex);    range.moveEnd('character', stopIndex - startIndex);    range.select();  } else {    textbox.setSelectionRange(startIndex, stopIndex);    textbox.focus();  }};const copyContent = (text) => {  const textString = text.toString();  let input = document.querySelector('#copy-input');  if (!input) {    input = document.createElement('input');    input.id = 'copy-input';    input.readOnly = 'readOnly';    input.contentEditable = 'true';    input.style.position = 'absolute';    input.style.top = document.body.scrollTop;    input.style.zIndex = '-1000';    document.getElementById('app').appendChild(input);  }  input.value = textString;  // ios必须先选中文字且不反对 input.select();  selectInputText(input, 0, textString.length);  if (document.execCommand('copy')) {    document.execCommand('copy');    head.bridge('showToast', '手机号已复制，可疾速粘贴！');  }  input.blur();};

textarea标签实现复制

function selectTextArea(textArea) {  let range = document.createRange();  range.selectNodeContents(textArea);  let selection = window.getSelection();  selection.removeAllRanges();  selection.addRange(range);  textArea.setSelectionRange(0, textArea.value.length);}export function copyContent(textToCopy) {  const textString = textToCopy.toString();  let textArea = document.createElement('textArea');  textArea.setAttribute('readonly', true);  textArea.setAttribute('contenteditable', true);  textArea.value = textString;  textArea.style.position = 'absolute';  textArea.style.top = document.body.scrollTop;  textArea.style.zIndex = '-1000';  document.getElementById('app').appendChild(textArea);  textArea.focus();  textArea.select();  selectTextArea(textArea);  if (document.execCommand('copy')) {    document.execCommand('copy');    head.bridge('showToast', '手机号已复制，可疾速粘贴！');  }  document.getElementById('app').removeChild(textArea);}