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import classNames from 'classnames/bind';   //问题出在这步，没加bind
import styles from '../index.scss';  //引入scss文件
let cx = classNames.bind(styles); 

//....

     //这里不加单引号也可以，但是我还是习惯加单引号，看着像类名一点
        let liClass = cx({
            'completed': todo.completed,  
            'editing': this.state.editing
        });
        return (
            <li className={liClass}>
                {element}
            </li>
        )