JS复制到剪贴板之意料之外的坑

不多说，直接先上代码，

function copy2Clipboard(content) {
if (window.navigator && window.navigator.clipboard) {
  navigator.clipboard.writeText(content).then(() => {
    console.log('success')
  }, () => {
    console.log('failed')
    console.log(arguments)
  }).catch(e => {
    console.log(e)
  })
} else {
  var i = document.createElement("input")
  i.setAttribute("style", "position:absolute;z-index:-1;width:1px;height:1px;top:-1px;opacity:0;-webkit-user-select: text;")
  document.body.appendChild(i)
  i.value = content
  var t = i.contentEditable,
    n = i.readOnly,
    o = document.createRange();
  i.contentEditable = !0
  i.readOnly = !1
  o.selectNodeContents(i);
  var a = window.getSelection();
  a.removeAllRanges()
  a.addRange(o)
  i.setSelectionRange(0, 999999)
  i.contentEditable = t
  i.readOnly = n
  window.document.execCommand("Copy")
  i.blur()
  document.body.removeChild(i)
  i = null
}
}

坑

1. 部分浏览器对navigator.clipboard支持很差，建议用else的代码；
2. Safari如果要访问剪贴板，需要在可信的HTTPS环境下执行，自签的证书是无法调用execCommand/avigator.clipboard.writeText的

附录：一个之前写的有注释的版本

function copyToClipboard(text) {
    if (text === "") return;
    var ipt = document.createElement('input'); // maybe you need to change `input` to `textarea`
    ipt.setAttribute(
        'style',
        'position:absolute;z-index:-1;width:1px;height:1px;top:-1px;opacity:0;-webkit-user-select: text;'
    )
    document.body.appendChild(ipt)
    ipt.value = text
    // ipt.select()
    if (/iphone|ipad|ios/.test(navigator.userAgent.toLowerCase())) {
        var oldContentEditable = ipt.contentEditable
        var oldReadOnly = ipt.readOnly
        var range = document.createRange()

        ipt.contentEditable = true
        ipt.readOnly = false
        range.selectNodeContents(ipt)

        var s = window.getSelection()
        s.removeAllRanges()
        s.addRange(range)

        ipt.setSelectionRange(0, 999999) // A big number, to cover anything that could be inside the element.

        ipt.contentEditable = oldContentEditable
        ipt.readOnly = oldReadOnly
    } else {
        ipt.select()
    }
    window.document.execCommand('Copy')
    ipt.blur()
    document.body.removeChild(ipt)
    ipt = null
}