javascript - jquery each loop gets the width of the div and assigns it to the parent element. Why is the result wrong?

Question

<script src="jquery.js"></script>
<p id="a1">
    <p class="aa" style="width: 200px;">423423423423423423423</p>
    <p class="aa" style="width: 180px;">42342342342342342</p>
    <p class="aa" style="width: 150px;">123123</p>
</p>
<script>
var w = 0
$("#a1 .aa").each(function(){
    w += $("#a1 .aa").width();//获取宽度。并累加
})
$("#a1").width(w)
</script>
<style>
    .aa{
        display: inline-block;
    }
</style>

Originally the result should be like this

But after removing the inline style, the result is great.

Why remove inline styles. That's it? ? ? ?

Answer 1

Shorten style标签对放到dom和js之前
你的代码结构如果没有行内样式，会先把.aa按照块级元素处理，宽度为100%
js处理完成之后才读取style标签对，把.aa处理为行内块级元素 the width
The synchronized code must be positioned correctly

Answer 2

w += $("#a1 .aa").width();//Get the width. And add up

w += $(this).width();

Answer 3

Put the style in style at the top. The page is loaded from top to bottom. p is a block-level element. .aa{display:inlne-block;} does not work at the bottom

Answer 4

$("#a1 .aa").each(function(){
    w += $("#a1 .aa").width();
    //这里用错了，应该用$(this).width(),不然累加的是第一个的宽度,
    //用w += $(this).width();我这本地测试530px
})

Answer 5

$("#a1 .aa").width();//这样默认取的是第一个.aa的宽度，也就是200，所以最后是600
第二次你删除行内样式后,得到p占据一行的宽度(因为inline-block还没生效)，所以得到三倍的整行宽度

Answer 6

Answer 7

You don’t understand the true meaning of $(selector)
Go and check what will be returned and you will know the problem

$("#a1 .aa").each(function(){
    w += $("#a1 .aa").width(); // 这一句会返回什么？
})

Another question
You need to understand where the style will be added and will it be loaded in advance?
What is the execution of script?