react如何动态增加节点

/**********组件KmcDialog************/
/**
*显示弹框
*/
KmcDialog.showInstance=function(properties){
if(!document.getElementById("KmcDialog")){
letprops=properties||{};
letdiv=document.createElement('div');
div.setAttribute('id','KmcDialog');
document.body.appendChild(div);
ReactDOM.render(React.createElement(KmcDialog,props),div);
}
}
/**
*删除弹框
*/
KmcDialog.removeInstance=function(){
if(document.getElementById("KmcDialog")){
document.getElementById('KmcDialog').remove();
}
}

KmcDialog.showInstance({
isShow:true
});
KmcDialog.removeInstance();