2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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# [postcss][postcss]-zindex [][ci] [][npm] [][deps]
> Reduce z-index values with PostCSS.
## Install
With [npm](https://npmjs.org/package/postcss-zindex) do:
```
npm install postcss-zindex --save
```
## Example
Sometimes, you may introduce z-index values into your CSS that are larger than
necessary, in order to improve your understanding of how each stack relates to
the others. For example, you might have a modal overlay at `5000` and the dialog
for it at `5500` - so that modal classes occupy the `5xxx` space.
But in production, it is unnecessary to use such large values for z-index where
smaller values would suffice. This module will reduce all z-index declarations
whilst respecting your original intent; such that the overlay becomes `1` and
the dialog becomes `2`. For more examples, see the [tests](test.js).
### Input
```css
.modal {
z-index: 5000
}
.modal-overlay {
z-index: 5500
}
```
### Output
```css
.modal {
z-index: 1
}
.modal-overlay {
z-index: 2
}
```
Note that this module does not attempt to normalize relative z-index values,
such as `-1`; indeed, it will abort immediately when encountering these values
as it cannot be sure that rebasing mixed positive & negative values will keep
the stacking context intact. Be careful with using this module alongside
JavaScript injected CSS; ideally you should have already extracted all of your
stacking context into CSS.
## API
### zindex([options])
#### options
##### startIndex
Type: `number`
Default: `1`
Set this to any other positive integer if you want to override z-indices from
other sources outside your control. For example if a third party widget has a
maximum z-index of `99`, you can set this to `100` and not have to worry about
stacking conflicts.
## Usage
See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
examples for your environment.
## Contributing
Pull requests are welcome. If you add functionality, then please add unit tests
to cover it.
## License
MIT © [Ben Briggs](http://beneb.info)
[ci]: https://travis-ci.org/ben-eb/postcss-zindex
[deps]: https://gemnasium.com/ben-eb/postcss-zindex
[npm]: http://badge.fury.io/js/postcss-zindex
[postcss]: https://github.com/postcss/postcss
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