h元素元素元素函数可用set和show规则自定义样式。
set和show规则自定义样式。Inserts horizontal spacing into a paragraph.
The spacing can be absolute, relative, or fractional. In the last case, the remaining space on the line is distributed among all fractional spacings according to their relative fractions.
Example
First #h(1cm) Second \
First #h(30%) Second \
First #h(2fr) Second #h(1fr) Third
Mathematical Spacing
In mathematical formulas, you can additionally use these
constants to add spacing between elements: thin, med, thick, quad, wide.
参数参数参数是传给函数的输入，写在函数名后的括号中。
weak可用set规则可用set规则可用set规则设置参数，更改后续调用时的默认值。
set规则设置参数，更改后续调用时的默认值。If true, the spacing collapses at the start or end of a paragraph.
Moreover, from multiple adjacent weak spacings all but the largest one
collapse.
Weak spacing in markup also causes all adjacent markup spaces to be
removed, regardless of the amount of spacing inserted. To force a space
next to weak spacing, you can explicitly write #" " (for a normal
space) or ~ (for a non-breaking space). The latter can be useful to
create a construct that always attaches to the preceding word with one
non-breaking space, independently of whether a markup space existed in
front or not.
默认值： false
展开例子
#h(1cm, weak: true)
We identified a group of _weak_
specimens that fail to manifest
in most cases. However, when
#h(8pt, weak: true) supported
#h(8pt, weak: true) on both sides,
they do show up.
Further #h(0pt, weak: true) more,
even the smallest of them swallow
adjacent markup spaces.
