app:
打包成"app"时判断高德、腾讯是否安装。
"https://www.html5plus.org/doc/zh_cn/runtime.html#plus.runtime..." (https://link.segmentfault.com/?enc=gI%2FzKPOnAhq%2FPJk4S1qAlg%3D%3D.Y1cAyFoelGegwZEwxDR4spve1VIAwbH0nTWkut%2F18d8%2BpQ3eg7%2FIzs0AFGiZE2x%2BUseWd4F5KvpMWqy39hHXlkSsgBgfUZFz%2FXg8nIozD5i14MSL%2BE0Pamndqbhlc6eU)
h5:
"h5"的话,对"navigator.userAgent"进行判断。