Classname Operation

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// 增加目标class
function addClass(target = '', srcCls = '') {
    const clss = target.split(/\s+/)
    return [...clss.filter(cls => !clss.includes(cls)), srcCls]
}

function removeClass(target = '', srcCls = '') {
    const clss = target.split(/\s+/)
    return [...clss.filter(cls => !clss.includes(srcCls))]
}