fix: fix srcset transform for absolute urls (fix #1005)

Author: yyx990803

lib/template-compiler/modules/transform-srcset.js

@@ -1,12 +1,10 @@
 // vue compiler module for transforming `img:srcset` to a number of `require`s
 
-module.exports = function () {
-  return {
-    postTransformNode: node => {
-      transform(node)
-    }
+module.exports = () => ({
+  postTransformNode: node => {
+    transform(node)
   }
-}
+})
 
 function transform (node) {
   const tags = ['img', 'source']
@@ -15,8 +13,8 @@ function transform (node) {
     node.attrs.forEach(attr => {
       if (attr.name === 'srcset') {
         // same logic as in transform-require.js
-        var value = attr.value
-        var isStatic = value.charAt(0) === '"' && value.charAt(value.length - 1) === '"'
+        const value = attr.value
+        const isStatic = value.charAt(0) === '"' && value.charAt(value.length - 1) === '"'
         if (!isStatic) {
           return
         }
@@ -43,12 +41,14 @@ function transform (node) {
 
 function urlToRequire (url) {
   // same logic as in transform-require.js
-  var firstChar = url.charAt(0)
+  const firstChar = url.charAt(0)
   if (firstChar === '.' || firstChar === '~') {
     if (firstChar === '~') {
-      var secondChar = url.charAt(1)
-      url = '"' + url.slice(secondChar === '/' ? 2 : 1)
+      const secondChar = url.charAt(1)
+      url = url.slice(secondChar === '/' ? 2 : 1)
     }
     return `require("${url}")`
+  } else {
+    return `"${url}"`
   }
 }