vue中操作class的方法封装

// 操作dom
export function getClass (ele) {
  return ele.className.replace(/\s+/, ' ').split(' ')
}

export function hasClass (ele, cls) {
  return (' ' + ele.className + ' ').indexOf(' ' + cls + ' ') > -1
}

export function addClass (ele, cls) {
  if (!hasClass(ele, cls)) {
    ele.className += ' ' + cls
    var curClass = ele.className

    var classes = (cls || '').split(' ')
    for (var i = 0, j = classes.length; i < j; i++) {
      var clsName = classes[i]
      if (!clsName) continue

      if (ele.classList) {
        ele.classList.add(clsName)
      } else if (!hasClass(ele, clsName)) {
        curClass += ' ' + clsName
      }
    }
    if (!ele.classList) {
      ele.className = curClass
    }
  }
}

export function removeClass (ele, cls) {
  if (hasClass(ele, cls)) {
    var reg = new RegExp('(\\s|^)' + cls + '(\\s|$)', 'gi')
    ele.className = ele.className.replace(reg, ' ')
  }
}

export function toggleClass (ele, cls) {
  if (hasClass(ele, cls)) {
    removeClass(ele, cls)
  } else {
    addClass(ele, cls)
  }
}