回答編集履歴
1
調整
test
CHANGED
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@@ -5,3 +5,79 @@
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5
5
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動かすためのトリガーに「active02のstyle属性を無効」を書くだけでは？
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6
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自然に変わるわけでもないでしょうしね
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+
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# sample
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```javascript
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<style>
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.active01{color:red;}
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.active02{background-Color:yellow;}
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</style>
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<script>
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window.addEventListener('DOMContentLoaded',function(){
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var t = document.querySelectorAll(".test")[0];
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var mo = new MutationObserver(function(r){
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console.log(r[0].oldValue);
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console.log(r[0].target.classList);
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});
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const opt = {
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attributes: true,
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attributeOldValue:true,
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attributeFilter:['class'],
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};
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mo.observe(t, opt);
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document.querySelector('#btn1').addEventListener('click',function(e){
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if(t1=document.querySelectorAll(".test")[0]) t1.classList.remove('active01');
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if(t2=document.querySelectorAll(".test")[2]) t2.classList.add('active01');
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});
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document.querySelector('#btn2').addEventListener('click',function(e){
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});
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});
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</script>
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<input type="button" id="btn1" value="change active01 1→3">
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<div class="test active01">BOX1</div>
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<div class="test active02">BOX2</div>
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<div class="test">BOX3</div>
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<div class="test">BOX4</div>
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<div class="test">BOX5</div>
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```
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