var doc = app.activeDocument

var spotList = []

for (var i = 0; i < doc.spots.length; i++) {
    if (doc.spots[i].colorType == ColorModel.SPOT) {
        // doc.spots[i].remove()
        doc.spots[i].colorType = ColorModel.PROCESS
        // spotList.push(doc.spots[i])
    }
}

var mySpot = doc.spots.add()
mySpot.name = "ÎÒÒª×ÔѧÍø"
mySpot.colorType = ColorModel.SPOT

var myColor = new CMYKColor()
myColor.cyan = 100
myColor.megenta = 0
myColor.yellow = 0
myColor.black = 0

mySpot.color = myColor