add more files

src/utils/verification.js

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+import { errorHandle } from './index';
+
+export default function verification(option) {
+  errorHandle(option.container, '\'container\' option is required.');
+
+  errorHandle(option.url, '\'url\' option is required.');
+
+  errorHandle(
+    option.container instanceof Element,
+    `'container' option require 'Element' type, but got '${typeof option.container}'.`
+  );
+
+  errorHandle(
+    typeof option.url === 'string' || Array.isArray(option.url),
+    `'url' option require 'string' or 'array' type, but got '${typeof option.url}'.`
+  );
+
+  errorHandle(
+    typeof option.poster === 'string',
+    `'url' option require 'string' type, but got '${typeof option.poster}'.`
+  );
+
+  errorHandle(
+    typeof option.volume === 'number',
+    `'volume' option require 'number' type, but got '${typeof option.volume}'.`
+  );
+
+  errorHandle(
+    typeof option.autoplay === 'boolean',
+    `'autoplay' option require 'boolean' type, but got '${typeof option.autoplay}'.`
+  );
+
+  errorHandle(
+    ['none', 'metadata', 'auto'].indexOf(option.preload) > -1,
+    '\'preload\' option require one of \'none、metadata、auto\'.'
+  );
+}