Fix the bug of failing to get values from MapEx in some old browsers
Fix the bug of failing to get values from MapEx in some old browsers

partridgejiang/Kekule.js,partridgejiang/Kekule.js,partridgejiang/Kekule.js,partridgejiang/Kekule.js,partridgejiang/Kekule.js,partridgejiang/Kekule.js