export
function hasClass(el, className) {
let reg =
new RegExp('(^|\\s)' className '(\\s|$)'
)
return reg.test(el.className)
}
export function addClass(el, className) {
if (hasClass(el, className)) {
return
}
let newClass = el.className.split(' '
)
newClass.push(className)
el.className = newClass.join(' '
)
}
addClass(元素, 'item-类名')
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