Javascript:如何将所有选项从一个选择元素复制到另一个? [英] Javascript: How to copy all options from one select element to another?

问题描述

如何将一个select元素的所有options复制到另一元素?请给我最简单的方法，我对循环过敏.

How can I copy all options of one select element to another? Please give me the easiest way, I'm allergic to looping.

请帮助我.预先感谢！

推荐答案

html:

<select id="selector_a">
    <option>op 1</option>
    <option>op 2</option>
</select>

<select id="selector_b">
    <option>op 3</option>
    <option>op 4</option>
</select>

javascript:

javascript:

var first = document.getElementById('selector_a');
var options = first.innerHTML;

var second = document.getElementById('selector_b');
var options = second.innerHTML + options;

second.innerHTML = options;

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