[Bug] markdownIt的this指向问题

[jinwei1116]

🐛 Bug Report

https://github.com/hinesboy/mavonEditor/blob/master/src/lib/mixins/markdown.js 这个文件中代码有问题 $_render(src, func, res) { var $vm = this; var deal = 0; for (var i = 0; i < needLangs.length; i++) { var url = $vm.p_external_link.hljs_lang(needLangs[i]); loadScript(url, function () { deal = deal + 1; if (deal === needLangs.length) { res = this.markdownIt.render(src); func(res); } }) } } 这个函数中this.markdownIt这个的this指向有问题，这个this应该改文$vm，目前的this是指向不到markdownIt的，会报错

Steps To Reproduce

Screenshots

The expected behaviour

Possible solution (optional, but very helpful)

[thwblueboy]

有人修，但是感觉没人merge和release的样子…… https://github.com/hinesboy/mavonEditor/pull/899

[thwblueboy]

我看到已经merge和release了