JavaScript复制任意字符串

var copy = function (str) {

    var div = document.createElement("div");

    div.innerHTML = '<span>' + str + '</span>';

    document.body.appendChild(div);

    var range = document.createRange();

    var selection = window.getSelection();

    selection.removeAllRanges();

    range.selectNodeContents(div);

    selection.addRange(range);

    document.execCommand('copy');

    selection.removeAllRanges();

    document.body.removeChild(div);

};

调用copy("要复制的字符串")即可快速复制