right 沒定寬 為啥我這里顯示的0，而不是你顯示的100%呢？
<!DOCTYPE?html>
<html?lang="en">
<head>
????<meta?charset="UTF-8">
????<title>兩列布局</title>
????<style>
????????.left,?.right?{
????????????height:?300px;
????????}
????????.left?{
????????????width:?300px;
????????????background-color:?#c9394a;
????????????float:?left;
????????}
????????.right?{
????????????background-color:?#cccccc;
????????????float:?left;
????????}
????</style>
</head>
<body>
????<div?class="left"></div>
????<div?class="right"></div>
</body>
</html>
2019-10-28
right不要設置float:left，設置浮動會脫離文檔流，就不會繼承父級寬度了，自然寬度是0
2019-10-28
老師能解答下嗎？