vue / 微信小程序实现富文本(richtext)图片宽度自适应

• 工具 richText.js

/**
 * 处理富文本里的图片宽度自适应
 * 1.去掉img标签里的style、width、height属性
 * 2.img标签添加style属性：max-width:100%;height:auto
 * 3.修改所有style里的width属性为max-width:100%
 * 4.去掉<br/>标签
 * @param html
 * @returns {void|string|*}
 */
function formatRichText(html, p_class = "fsmp") {
	if (!html) {
		return ''
	}

	let newContent = html
	if (html.indexOf("<img") != -1) {
		newContent = html.replace(/<img[^>]*>/gi, function (match, capture) {
			match = match.replace(/style="[^"]+"/gi, "").replace(/style='[^']+'/gi, "")
			match = match.replace(/style=""/gi, "")
			match = match.replace(/width="[^"]+"/gi, "").replace(/width='[^']+'/gi, "")
			match = match.replace(/height="[^"]+"/gi, "").replace(/height='[^']+'/gi, "")
			return match
		})
		newContent = newContent.replace(/style="[^"]+"/gi, function (match, capture) {
			match = match.replace(/width:[^;]+;/gi, "max-width:100%;").replace(/width:[^;]+;/gi, "max-width:100%;")
			return match
		})
		newContent = newContent.replace(/<br[^>]*\/>/gi, "")
		newContent = newContent.replace(/\<img/gi, '<img style="max-width:100%;height:auto;display:block;margin-top:0;margin-bottom:0;"')
	}

	newContent = newContent.replace(/<br[^>]*\/>/gi, "")
	newContent = newContent.replace(/<a>/gi, `<a class="${p_class} p_class_color "`)
	newContent = newContent.replace(/<li>/gi, `<li class="${p_class} p_class_color "`)
	newContent = newContent.replace(/\<p/gi, `<p class="${p_class} p_class_color "`)
	newContent = newContent.replace(/\<span/gi, `<span class="${p_class} p_class_color "`)

	return newContent
}

module.exports = {
	formatRichText
}