[feat] promise based jsonp

.gitignore

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+# Created by .ignore support plugin (hsz.mobi)
+.idea/
+.classpath
+.project
+.settings/
+node_modules
+.DS_Store
+*.log

README.md

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-# simple-jsonp-promise
+# simple-jsonp-promise
+
+## Installation
+
+``` bash
+yarn add simple-jsonp-promise
+```
+
+## Example
+
+``` bash
+import jsonp from 'simple-jsonp-promise'
+let options = {
+        params:{
+            a : 1,
+            b : 2
+        },
+        jsonp : 'callback',
+        prefix : '__jp',
+        timeout : 15000
+    }
+let response = await jsonp('https://localhost/api.jsonp' , options);
+```

index.js

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+/**
+ * Created by lizq on 2017/8/7
+ */
+
+// Callback index.
+let count = 0;
+/**
+ * JSONP handler
+ *
+ * Options:
+ * - prefix {String} callback prefix (defaults to `__jp`)
+ * - jsonp {String} qs jsonpeter (defaults to `callback`)
+ * - timeout {Number} how long after the request until a timeout error
+ *   is emitted (defaults to `15000`)
+ */
+let jsonp = function( url, options ) {
+    options     = options || {};
+    let prefix  = options.prefix || '__jp';
+    let jsonp   = options.jsonp || 'callback';
+    let params  = options.params || {};
+    let timeout = options.timeout ? options.timeout : 15000;
+    let target  = document.getElementsByTagName( 'script' )[ 0 ] || document.head;
+    let script;
+    let timer;
+    let cleanup;
+    let promise;
+    let noop    = function() {};
+    // Generate a unique id for the request.
+    let id      = prefix + (count++);
+    cleanup     = function() {
+        // Remove the script tag.
+        if ( script && script.parentNode ) {
+            script.parentNode.removeChild( script );
+        }
+        window[ id ] = noop;
+        if ( timer ) { clearTimeout( timer ); }
+    };
+    promise     = new Promise( ( resolve, reject ) => {
+        if ( timeout ) {
+            timer = setTimeout( function() {
+                cleanup();
+                reject( new Error( 'Timeout' ) );
+            }, timeout );
+        }
+        window[ id ]    = function( data ) {
+            cleanup();
+            resolve( data );
+        };
+        params[ jsonp ] = id;
+        for ( let key in params ) {
+            url += (~url.indexOf( '?' ) ? '&' : '?') + key + '=' + encodeURIComponent( params[ key ] );
+        }
+        url            = url.replace( '?&', '?' );
+        // Create script.
+        script         = document.createElement( 'script' );
+        script.src     = url;
+        script.onerror = function() {
+            cleanup();
+            reject( new Error( 'Network Error' ) );
+        };
+        target.parentNode.insertBefore( script, target );
+    } );
+    return promise;
+};
+export default jsonp;

package.json

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+{
+  "name": "simple-jsonp-promise",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/liziqiang/simple-jsonp-promise.git"
+  },
+  "keywords": [
+    "jsonp",
+    "promise"
+  ],
+  "author": "Ziqiang Li <ziqiang.lee@gmail.com>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/liziqiang/simple-jsonp-promise/issues"
+  },
+  "homepage": "https://github.com/liziqiang/simple-jsonp-promise#readme"
+}