小程序之富文本转码

给富文本内容里面的图片添加显示规则，使其宽度为100%，高度自动适应，并清除原有的显示规则。

 /**
   * 富文本内容图片优化
   */
  formatRichText: function (richText) {
    if (richText != null) {
      let newRichText = richText.replace(/<img[^>]*>/gi, function (match, capture) {
        match = match.replace(/style="[^"]+"/gi, '').replace(/style='[^']+'/gi, '');
        match = match.replace(/width="[^"]+"/gi, '').replace(/width='[^']+'/gi, '');
        match = match.replace(/height="[^"]+"/gi, '').replace(/height='[^']+'/gi, '');
        return match;
      });
      newRichText = newRichText.replace(/style="[^"]+"/gi, function (match, capture) {
        match = match.replace(/width:[^;]+;/gi, 'width:100%;').replace(/width:[^;]+;/gi, 'width:100%;');
        return match;
      });

      // newRichText = newRichText.replace(/<br[^>]*\/>/gi, '');
      // newRichText = newRichText.str_replace(/\<img/gi, '< img style="width:100%"');
      newRichText = newRichText.replace(/\<img/gi, '<img style="max-width:100%;height:auto;display:block;"');
      return newRichText;
    } else {
      return null;
    }
  },