H5和客户端（IOS、安卓）交互

1.IOS

function setupWebViewJavascriptBridge(callback) {
    if (window.WebViewJavascriptBridge) { return callback(WebViewJavascriptBridge); }
    if (window.WVJBCallbacks) { return window.WVJBCallbacks.push(callback); }
    window.WVJBCallbacks = [callback];
    var WVJBIframe = document.createElement('iframe');
    WVJBIframe.style.display = 'none';
    WVJBIframe.src = 'https://__bridge_loaded__';
    document.documentElement.appendChild(WVJBIframe);
    setTimeout(function() { document.documentElement.removeChild(WVJBIframe) }, 0)
}
setupWebViewJavascriptBridge(function(bridge) {

    //注册一个方法（方法名是“JS Echo”），客户端进行调用（方法名也是“JS Echo”），responseCallback是回调函数
    bridge.registerHandler('JS Echo', function(data, responseCallback) {
        console.log("JS Echo called with:", data)
        responseCallback(data)
    })

    //客户端已经注册好一个名为“ObjC Echo”的方法，H5直接进行调用（方法名也为“ObjC Echo”）就行，调用的时候可以传客户端需要的参数
    bridge.callHandler('ObjC Echo', {'key':'value'}, function responseCallback(responseData) {
        console.log("JS received response:", responseData)
    })
})

Android

function connectWebViewJavascriptBridge (callback) { 
     if (window.WebViewJavascriptBridge) {
           callback(WebViewJavascriptBridge)
     } else {
           document.addEventListener(
               'WebViewJavascriptBridgeReady'
                , function() {
                     callback(WebViewJavascriptBridge)
                },
                false
           );
     }
}
connectWebViewJavascriptBridge (function(bridge) {

    //注册一个方法（方法名是“JS Echo”），客户端进行调用（方法名也是“JS Echo”），responseCallback是回调函数
    bridge.registerHandler('JS Echo', function(data, responseCallback) {
        console.log("JS Echo called with:", data)
        responseCallback(data)
    })

    //客户端已经注册好一个名为“ObjC Echo”的方法，H5直接进行调用（方法名也为“ObjC Echo”）就行，调用的时候可以传客户端需要的参数
    bridge.callHandler('ObjC Echo', {'key':'value'}, function responseCallback(responseData) {
        console.log("JS received response:", responseData)
    })
})