Add defer to options

Readme.md

@@ -28,6 +28,7 @@ Any url that you would like to load.  May be absolute or relative.
 A map of options.  Here are the currently supported options:
 
 * `async` - A boolean value used for `script.async`.  By default this is `true`.
+* `defer` - A boolean value used for `script.defer`.  By default this is `true`.
 * `attrs` - A map of attributes to set on the `script` node before appending it to the DOM.  By default this is empty.
 * `charset` - A string value used for `script.charset`.  By default this is `utf8`.
 * `text` - A string of text to append to the `script` node before it is appended to the DOM.  By default this is empty.

index.js

@@ -14,6 +14,7 @@ module.exports = function load (src, opts, cb) {
   script.type = opts.type || 'text/javascript'
   script.charset = opts.charset || 'utf8';
   script.async = 'async' in opts ? !!opts.async : true
+  script.defer = 'defer' in opts ? !!opts.defer : true
   script.src = src
 
   if (opts.attrs) {

test/index.js

@@ -23,6 +23,22 @@ test('opts.async', function(done) {
   })
 });
 
+test('opts.defer.true', function(done) {
+  load('test/hello.js', {defer: true}, function(err, script) {
+    assert.ifError(err);
+    assert.equal(script.defer, true);
+    done();
+  })
+});
+
+test('opts.defer.false', function(done) {
+  load('test/hello.js', {defer: false}, function(err, script) {
+    assert.ifError(err);
+    assert.equal(script.defer, false);
+    done();
+  })
+});
+
 test('opts.attrs', function(done) {
   load('test/hello.js', {attrs: {foo: 'boo'}}, function(err, script) {
     assert.ifError(err);