如何将绝对定位的元素与中心对齐? [英] How to align absolutely positioned element to center?
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问题描述
我正在尝试将两个画布堆叠在一起,使其成为双层画布.
I am trying to stack two canvas together and make it a double layers canvas.
我在这里看到了一个例子:
I've saw an example here:
<div style="position: relative;">
<canvas id="layer1" width="100" height="100"
style="position: absolute; left: 0; top: 0; z-index: 0;"></canvas>
<canvas id="layer2" width="100" height="100"
style="position: absolute; left: 0; top: 0; z-index: 1;"></canvas>
</div>
但是我想将两个画布都设置在屏幕中央.如果我将left
的值设置为常数,则在更改屏幕方向(如在iPad上进行aps操作)时,画布将不会像其作用一样保留在屏幕中间>
But i would like to set both of the canvas align at the center of the screen. If i set the value of left
as a constant, while I change the orientation of the screen (as I'm doing aps on iPad) the canvas won't remain at the middle of the screen like how it act in
<div align="center">
任何人都可以帮忙吗?
推荐答案
如果将左右两个都设置为零,并且将左右边距设置为自动,则可以将绝对定位的元素居中.
If you set both left and right to zero, and left and right margins to auto you can center an absolutely positioned element.
position:absolute;
left:0;
right:0;
margin-left:auto;
margin-right:auto;
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