#### 改造postcss-px-to-viewport

##### 增加exclude配置项
配置文件.postcssrc.js（修改第三方库被影响的情况）
``"postcss-px-to-viewport-fix": { viewportWidth: 750, viewportHeight: 1334, unitPrecision: 3, viewportUnit: 'vw', selectorBlackList: ['.ignore', '.hairlines'], minPixelValue: 1, mediaQuery: false, exclude: /(\/|\\)(node_modules)(\/|\\)/ },`

postcss-px-to-viewport)`





A plugin for PostCSS that generates viewport units (vw, vh, vmin, vmax) from pixel units.



Usage



If your project involves a fixed width, this script will help to convert pixels into viewport units.



$3

css

// input



.class {

  margin: -10px .5vh;

  padding: 5vmin 9.5px 1px;

  border: 3px solid black;

  border-bottom-width: 1px;

  font-size: 14px;

  line-height: 20px;

}



.class2 {

  border: 1px solid black;

  margin-bottom: 1px;

  font-size: 20px;

  line-height: 30px;

}



@media (min-width: 750px) {

  .class3 {

    font-size: 16px;

    line-height: 22px;

  }

}



// output



.class {

  margin: -3.125vw .5vh;

  padding: 5vmin 2.96875vw 1px;

  border: 0.9375vw solid black;

  border-bottom-width: 1px;

  font-size: 4.375vw;

  line-height: 6.25vw;

}



.class2 {

  border: 1px solid black;

  margin-bottom: 1px;

  font-size: 6.25vw;

  line-height: 9.375vw;

}



@media (min-width: 234.375vw) {

  .class3 {

    font-size: 5vw;

    line-height: 6.875vw;

  }

}

$3

js

'use strict';



var fs = require('fs');

var postcss = require('postcss');

var pxToViewport = require('..');

var css = fs.readFileSync('main.css', 'utf8');

var options = {

    replace: false

};

var processedCss = postcss(pxToViewport(options)).process(css).css;



fs.writeFile('main-viewport.css', processedCss, function (err) {

  if (err) {

    throw err;

  }

  console.log('File with viewport units written.');

});





$3



Default:

js

{

  viewportWidth: 320,

  viewportHeight: 568,

  unitPrecision: 5,

  viewportUnit: 'vw',

  selectorBlackList: [],

  minPixelValue: 1,

  mediaQuery: false

}

viewportWidth

 (Number) The width of the viewport.

-

viewportHeight

 (Number) The height of the viewport.

-

unitPrecision

 (Number) The decimal numbers to allow the REM units to grow to.

-

viewportUnit

 (String) Expected units.

-

selectorBlackList

 (Array) The selectors to ignore and leave as px.

    - If value is string, it checks to see if selector contains the string.

        -

['body'] will match .body-class



    - If value is regexp, it checks to see if the selector matches the regexp.

        -

[/^body$/] will match body but not .body

minPixelValue

 (Number) Set the minimum pixel value to replace.

-

mediaQuery

 (Boolean) Allow px to be converted in media queries.





$3

js

var gulp = require('gulp');

var postcss = require('gulp-postcss');

var pxtoviewport = require('postcss-px-to-viewport');



gulp.task('css', function () {



    var processors = [

        pxtoviewport({

            viewportWidth: 320,

            viewportUnit: 'vmin'

        })

    ];



    return gulp.src(['build/css/*/.css'])

        .pipe(postcss(processors))

        .pipe(gulp.dest('build/css'));

});