code: function initStyleProcessor(opts) {
      registerProcessor({
          name: 'wxss2css',
          // using the existed postcss processor
          processor: 'postcss',
          extnames: ['wxss'],
          rext: 'css',
          options: opts || {
              plugins: [
                  wxssPlugin
              ]
          }
      });
  }
docs: Initialize wx style processor
  
  @inner
  @param {Object=} opts the processor init options
  @param {Array=} opts.plugins the postcss plugins