vue远程加载sfc组件思路详解

const compile = require('vue-template-compiler')

// 获取sfc组件的源码
const str = fs.readFileSync(path.resolve(__dirname, `../components/sfc.vue`), 'utf-8')

// vue-loader内置，现在用来解析SFC（单文件组件）
let sfc = compile.parseComponent(str)

// 获取sfc组件配置
let sfcOptions = getComponentOption(sfc)

import { uuid } from 'utilscore'
import stylus from 'stylus'
import sass from 'sass'
import less from 'less'
const getComponentOption = sfc => {
  // 生成data-u-id 
  const componentId = uuid(8, 16).toLocaleLowerCase()  
  // 标签添加data-u-id属性  
  const template = sfc.template ? tagToUuid(sfc.template.content, componentId) : ''  
  // 转化style（less、sass、stylus）  
  let styles = []  
  sfc.styles.forEach(sty => {    
    switch (sty.lang) {      
      case 'stylus':        
        stylus.render(sty.content, (err, css) => styles.push(formatStyl(sty, css, componentId)))        
        break;      
      case 'sass':      
      case 'scss':        
        styles.push(formatStyl(sty, sass.renderSync({ data: sty.content }).css.toString(), componentId))        
        break;      
      case 'less':        
        less.render(sty.content, (err, css) => styles.push(formatStyl(sty, css, componentId)))        
        break;    
    }  
  })  
  let options = {    
    script: sfc.script ? $require(null, sfc.script.content) : {},    
    styles,    
    template  
  }  
  return JSON.stringify(options, (k, v) => {
    if(typeof(v) === 'function') {
      let _fn = v.toString()
      return /^function()/.test(_fn) ? _fn : fn.replace(/^/,'function ')
    }
    return v
  })
}

const tagToUuid = (tpl, id) => {  
  var pattern = /<[^\/]("[^"]*"|'[^']*'|[^'">])*>/g  
  return tpl.replace(pattern, $1 => {    
    return $1.replace(/<([\w\-]+)/i, ($2, $3) => `<${$3} data-u-${id}`)  
  })
}

const formatStyl = (sty, css, componentId) => {  
  let cssText = css  
  if (sty.scoped) {    
    cssText = css.replace(/[\.\w\>\s]+{/g, $1 => {      
    if (/>>>/.test($1)) return $1.replace(/\s+>>>/, `[data-u-${componentId}]`)      
    return $1.replace(/\s+{/g, $2 => `[data-u-${componentId}]${$2}`)    
    })  
  }  
  return cssText
}

const $require = (filepath, scriptContext) => {
  const filename = path.resolve(__dirname, `../${filepath}`);  
  const module = { exports: {} }  
  let code = scriptContext ? scriptContext : fs.readFileSync(filename, 'utf-8')  
  let exports = module.exports  
  code = `(function($require,module,exports,__dirname,filename){$[code]})($require,module,exports,__dirname,filename)`  
  eval(code)  
  return module.exports
} 

<template> 
  <component :is="remote" v-bind="$attrs" v-on="$listeners"></component>
</template>
<script>
import Vue from "vue";
export default { 
  data() {  
    return {   
      remote: null  
    }
  }, 
  props: {  
    tagName: {   
      type: String,   
      defualt: "componentName"  
    } 
  }, 
  created() {  
    fetch("http://localhost:3000/getComponent/"+this.tagName)
      .then(res => res.json())   
      .then(sfc => {    
        let options = this.parseObj(sfc);    
        options.styles.forEach(css => this.appendSty(css));    
        this.remote = Vue.extend({ 
          ...options.script,     
          name: options.script.name || this.tagName,     
          template: options.template    
        });   
      }); 
   }, 
   methods: {  
    isObject(v) {   
      return Object.prototype.toString.call(v).includes("Object");  
    },  
    parseObj(data) {   
      if (Array.isArray(data)) return data.map(row => this.parseObj(row));   
      if (this.isObject(data)) {    
        let ret = {};    
        for (let k in data) {     
          ret[k] = this.parseObj(data[k]);    
         }    return ret;   
      }   
      try {    
        let pattern = /function ([\w]+)\(\) \{ \[native code\] \}/;    
        if (pattern.test(data)) {     
          return window[pattern.exec(data)[1]];    
        } else {     
          let evalData = eval(`(${data})`);     
          return typeof evalData == "function" ? evalData : data;    
        }   
      } catch (err) {    
        return data;   
      }  
    },  
    appendSty(css) { // 生成组件样式   
      let style = document.createElement("style");   
      style.setAttribute("type", "text/css");   
      var cssText = document.createTextNode(css);   
      style.appendChild(cssText);   
      var head = document.querySelector("head");   
      head.appendChild(style);  
    } 
}};
</script>

<template> 
  <div class="test">  
    <div>   
      <p @click='$emit("handleClick",'点我')'>远程组件--{{msg}}--{{text}}</p>  
      </div> 
    </div>
</template>
<script>
// 加载js脚本
let {a} = $require('utils/test.js') 
module.exports = { 
  data: function() {  
    return {   
      msg: "remote component",
      ...a,
    } 
  }, 
  props: {  
    text: {   
      type: Boolean,   
      default: true  
    } 
  },
  mounted:function(){
    console.log('prop text is',this.text)
  }
};
</script>
<style lang="stylus" scoped>
.test { 
  .test2 {  
     color: red; 
  } 
  p{  
     color:red 
  }
}
</style>

// temolate
<remote text='123456' @handleClick='handleClick'/>

// script 
methods:{
 handleClick(v){
   console.log(v) // 点我 }
}