jQuery有一个.replaceWith()方法，可用于将一个元素替换为另一个元素.因此，请从输入中复制样式，并使用此方法，如下所示:

jQuery has a .replaceWith() method you can use to replace one element with another. So, copy your styles from the input and use this method, as follows:

$('input[size="100"]').each(function () {
    var style = $(this).attr('style'),
        textbox = $(document.createElement('textarea')).attr('style', style);
    $(this).replaceWith(textbox);
});

演示