如何计算跨度中每个字符的宽度和高度 [英] how to calculate width and height of each character in a span

问题描述

说的是，html看起来像：

 < span style =font-size：12px>测试100< span> 
  

所以，一种方法是用span范围的样式为每个角色制作一个虚拟范围，并将其附加到dom并获取它的高度和宽度。

使用查询的示例：

  var x = $（'< span style =font-size：12px>'+'T'+'< / span'>）; 
 $（'body'）。append（x）; 
 var h = x.height（），w = x.width（）; 
 x.remove（）; 
  

但这是低效的。有没有其他方法可以做到这一点？

解决方案

你不能真正得到一个字符的大小，因为它占用的空间取决于它旁边的字符。

例如，字符 A 和 V 紧接在一起，以便它们比 A旁边的 A 更接近。 或者 V 旁边的 V 。放置相同数量的字符交错，比将它们放在旁边的相同字符占用的空间更少：

AVAVAVAVAVAVAVAVAVAVAVAVAVAVAVAV -
AAAAAAAAAAAAAAAVVVVVVVVVVVVVVV

What is the best way to calculate the width and height of each character in a span.

Say, the html looks like:

 <span style="font-size:12px">Test 100<span>

So, one way is to make a dummy span for each character with the span's style and append it to dom and get it's height and width.

Example, using query:

 var x = $('<span style="font-size:12px">' + 'T' + '</span'>);
 $('body').append(x); 
 var h = x.height(),  w= x.width();
 x.remove();

But this is inefficient. Is there any other way to do it ?

解决方案

You can't really get the size of a character, because the amount of space it takes up depends on which characters it is next to.

For example, the characters A and V next to each other are kerned so that they are closer together than an A next to an A or a V next to a V. Putting the same number of characters interleaved takes less space than putting them next to the same characters:

AVAVAVAVAVAVAVAVAVAVAVAVAVAVAV
AAAAAAAAAAAAAAAVVVVVVVVVVVVVVV

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