H5_0015：判断是否是微信加载

    var e = document.createElement("script");

    e.src = "https://res.wx.qq.com/open/js/jweixin-1.3.2.js",

    document.body.appendChild(e),

    e.addEventListener("load", function() {

        wx.miniProgram.getEnv(function(e) {

            isWeChat = e.miniprogram

        })

    }),