react className 样式控制

1.<div className={ "formbox " + this.state.classArr }></div>

2. this.state.classArr = [];

<div className={ "formbox " + this.state.classArr.jion(" ") }> </div>

this.state.classArr.pop()

this.state.classArr.push(".demo") 可以更改class 页面也会出发更新

Like (){

this.setState({

　　isLike:!this.state.isLike

});

console.log(11);

}

<span className="like" onClick={ this.Like }><span className={ this.state.isLike ? 'active iconfont' : 'iconfont' } >&#xe870;</span>喜欢</span>