一个js有关问题，希望大家帮忙
一个js问题，希望大家帮忙
我有一个图层是叫
他想通过js把 class="demo" 替换成 id="demo"
但是var str=" "这里怎么写才能好吗？
------解决方案--------------------
先找到该对象， obj.id='demo'; obj.className='';
------解决方案--------------------
你原来已经有id了是吗？
要修改成
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