update readme

Author: gxlmyacc

README.md

@@ -1,6 +1,19 @@
 # vue-asset-loader 
 
-this is a file-loader wrapper for Vue and Webpack, solve the image relative path issues when HTML and CSS are not in the same directory.
+this is a `file-loader` wrapper for Vue and Webpack, solve the image relative path issues when HTML and CSS are not in the same directory.
+
+## install
+
+To begin, you'll need to install `vue-asset-loader`:
+
+```console
+$ npm install vue-asset-loader --save-dev
+```
+
+`vue-asset-loader` works like
+[`file-loader`](https://github.com/webpack-contrib/file-loader), but solve a file-loader`s relative path issue when image, css and html in diffrence directorys.
+
+## purpose
 
 if your output directory structure is like this:
 
@@ -17,28 +30,29 @@ script
   2.js
 ```
 1.css load 1.png, the url in source code may be write like this `url(images/1.png)`, to support that, your webpack config maybe like this:
-```
+```js
 { 
   test: /\.(png|jpe?g|gif|svg)(\?\S*)?$/, 
   use: [{ loader: 'file-loader', options: { publicPath: '../', name: '/images/[name].[ext]?[hash]' }]
 }
 ```
+
 then webpack will translate `images/1.png` to `../images/1.png`, this does solve the issues, but wait, if your html has img tag that:
-```
+```html
 <img src="image/2.png">
 ```
 webpack will translate `images/2.png` to `../images/2.png`, it leads html load `2.png` failure, so file-loader can't tell the picture from HTML or CSS.
 vue-asset-loader just solving this issues!
 your webpack config can be like this:
 
-```
+```js
 { 
   test: /\.(png|jpe?g|gif|svg)(\?\S*)?$/, 
   use: [{ loader: 'vue-asset-loader', options: { publicPath: '', publicStylePath: '../', name: '/images/[name].[ext]?[hash]' }]
 }
 ```
 or 
-```
+```js
 { 
   test: /\.(png|jpe?g|gif|svg)(\?\S*)?$/, 
   use: [{ 
@@ -54,3 +68,7 @@ or
 }
 ```
 vue-asset-loader will choose `publicPath` or `publicStylePath` based on the image from HTML or CSS.
+
+## License
+
+#### [MIT](./LICENSE)

index.js

@@ -6,7 +6,7 @@ function handlePath (path, url) {
   else return path + '/' + url;
 }
 let originPublicPath = undefined;
-module.exports = function loader (content) {
+module.exports = function loader () {
   let options = loaderUtils.getOptions(this) || {};
   if (options.publicStylePath) {
     if (originPublicPath === undefined) originPublicPath = options.publicPath;
@@ -18,5 +18,5 @@ module.exports = function loader (content) {
   }
 
   const fileLoader = require('file-loader');
-  return fileLoader.call(this, content);
+  return fileLoader.apply(this, arguments);
 };