複製文字到剪貼簿

var currentFocus = document.activeElement;
var textArea = document.createElement("textarea");
textArea.value = "123";
document.body.appendChild(textArea);
textArea.select();
document.execCommand("copy");
document.body.removeChild(textArea);
if (currentFocus) currentFocus.focus();

jquery

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var $temp = $("<input>");

$("body").append($temp);

$temp.val($(element).text()).select();

document.execCommand("copy");

$temp.remove();