destination is not defined

shouldComponentUpdate:function(newPros,newState){

if(newState.disnum < 5){

return true;

}else{

console.log("退出");

ReactDOM.unmountComponentAtNode(destination);

return false;

}

},

componentWillUnmount:function(){

console.log('willunmount')

return;

}

前面都是正确的，到了unmount这块就不行了。报destination没有定义：destination is not defined，怎么破？？？