``` (function (window, undefined) { // 调用 schema 的封装 function _invoke(action, data, callback) { // 拼装 schema 协议 var schema = 'myapp://utils/' + action // 拼接参数 schema += '?a=a' var key for (key in data) { if (data.hasOwnProperty(key)) { schema += '&' + key + data\[key\] } } // 处理 callback var callbackName = '' if (typeof callback === 'string') { callbackName = callback } else { callbackName = action + Date.now() window[callbackName] = callback } schema += 'callback=callbackName' // 触发 var iframe = document.createElement('iframe') iframe.style.display = 'none' iframe.src = schema // 重要！ var body = document.body body.appendChild(iframe) setTimeout(function () { body.removeChild(iframe) iframe = null }) } // 暴露到全局变量 window.invoke = { share: function (data, callback) { _invoke('share', data, callback) }, scan: function (data, callback) { _invoke('scan', data, callback) } login: function (data, callback) { _invoke('login', data, callback) } } })(window) ```