这是我针对不同情况的代码。Demo1:为什么红框和蓝框不在同一水平面上?

<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
body {
margin: 0;
}
#div1 {
display: inline-block;
background-color: red;
width: 50px;
height: 50px;
}
#div2 {
display: inline-block;
background-color: blue;
width: 50px;
height: 50px;
}
#div2-child {
width: 20px;
height: 20px;
background-color: yellow;
display: inline-block;
}
</style>
</head>
<body>
<div id="div1">x</div>
<div id="div2">
<div id="div2-child"></div>
</div>
</body>
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Demo2:在Demo1的基础上,我把x去掉了,为什么底部是蓝色的框。

<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
body {
margin: 0;
}
#div1 {
display: inline-block;
background-color: red;
width: 50px;
height: 50px;
}
#div2 {
display: inline-block;
background-color: blue;
width: 50px;
height: 50px;
}
#div2-child {
width: 20px;
height: 20px;
background-color: yellow;
display: inline-block;
}
</style>
</head>
<body>
<div id="div1"></div>
<div id="div2">
<div id="div2-child"></div>
</div>
</body>
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Demo3:为什么添加x后,每个div1和div-child都在同一行。

<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
body {
margin: 0;
}
#div1 {
display: inline-block;
background-color: red;
width: 50px;
height: 50px;
}
#div2 {
display: inline-block;
background-color: blue;
width: 50px;
height: 50px;
}
#div2-child {
width: 20px;
height: 20px;
background-color: yellow;
display: inline-block;
}
</style>
</head>
<body>
<div id="div1">x</div>
<div id="div2">
<div id="div2-child">x</div>
</div>
</body>
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Demo4:为什么只有div2有marginTop,而div1也感受到了marginTop。有什么办法让div1回到顶部吗?

<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
body {
margin: 0;
}
#div1 {
display: inline-block;
background-color: red;
width: 50px;
height: 50px;
}
#div2 {
display: inline-block;
background-color: blue;
width: 50px;
height: 50px;
margin-top: 100px;
}
</style>
</head>
<body>
<div id="div1"></div>
<div id="div2"></div>
</body>
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Jor*_*rdy -2
将其添加到您的 CSS 中:
display: flex使body盒子的位置在同一行。(参考)。margin-right: 10px在右边#div1留出空间#div1body {
margin: 0;
display: flex;
}
#div1 {
display: inline-block;
background-color: red;
width: 50px;
height: 50px;
margin-right: 10px;
}
#div2 {
display: inline-block;
background-color: blue;
width: 50px;
height: 50px;
}
#div2-child {
width: 20px;
height: 20px;
background-color: yellow;
display: inline-block;
}Run Code Online (Sandbox Code Playgroud)
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<div id="div1"></div>
<div id="div2">
<div id="div2-child"></div>
</div>
</body>Run Code Online (Sandbox Code Playgroud)
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