//使用自执行函数，避免污染同名变量
(function () {
	const languageList = ['zh-CN']
	const LOCAL_LANGUAGE = navigator.language.toLowerCase();
	const getLanguage = (language = localStorage.handPyLanguage || LOCAL_LANGUAGE) => {
		if (!languageList.includes(language) || !languageList.includes(language.split("-")[0]))
			language = 'zh-CN';
		const val = location.search.match(new RegExp('[?&]lang=([^&]+)'));
		if (val) {
			language = val ? decodeURIComponent(val[1].replace(/\+/g, '%20')) : '';
		}else{
			language = localStorage.handPyLanguage;
		}
		if (['en', 'zh-hant', 'zh-hans'].indexOf(language) < 0) {
			if (LOCAL_LANGUAGE === 'zh-cn' || LOCAL_LANGUAGE === 'zh') {
				language = 'zh-hans';
			} else if (LOCAL_LANGUAGE === 'zh-tw' || LOCAL_LANGUAGE === 'zh-hk') {
				language = 'zh-hant';
			} else {
				language = 'en';
			}
		}
		localStorage.handPyLanguage = language;
		document.write('<script src="blockly/msg/' + language + '/blockly_messages.js"><\/script>');
		document.write('<script src="blockly/msg/' + language + '/blocks_messages.js"><\/script>');
		document.write('<script src="blockly/msg/' + language + '/microbit_messages.js"><\/script>');
		document.write('<script src="blockly/msg/' + language + '/other_messages.js"><\/script>');
		document.write('<script src="blockly/msg/js/' + language + '.js"><\/script>');
	}
	getLanguage()
})()