add before scope id

Author: Hanks10100

lib/loader.js

@@ -210,8 +210,8 @@ module.exports = function (content) {
 
   var parts = parse(content, fileName, this.sourceMap)
   // var hasGlobal = parts.styles.some(function (s) { return !!s.global })
-  // var scopeId = hasGlobal ? '@GLOBAL' : genId(filePath)
-  var scopeId = genId(filePath)
+  // var scopeId = hasGlobal ? '@GLOBAL' : ('data-v-' + genId(filePath))
+  var scopeId = 'data-v-' + genId(filePath)
   var output = 'var __vue_exports__, __vue_options__\n'
 
   // css modules