自定义插件中的方法被调用一次后，再次调用，回到无法触发，报错

[ERROR] : [JS Framework] Failed to execute the callback function:
14:48:14.214 + TypeError: plus.postMessage is not a function. (In 'plus.postMessage({type:'requireNativePluginCallback',data:{id:parseInt(a.replace('CALLBACK_','')),ret:d,keepAlive:!!f}},b)', 'plus.postMessage' is undefined) __ERROR