点击显示跟隐藏出错，打断检查发现是else后面问题，但看不出原因！！！

Question

<script>

var button =document.getElementById('button');

var navv =document.getElementById('navv');

button.onclick=function (){

if ( navv.style.display='none') {

navv.style.display='block';

}

else {

navv.style.display='block'

}

}

</script>

Answer 1

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