[792491914]

if ( app.documents.length > 0 && app.activeDocument.pathItems.length > 0 ) {
// Define the new color value
newRGBColor = new RGBColor();
newRGBColor.red = 255;
newRGBColor.green = 0;
newRGBColor.blue = 0;
// Create the new spot
var newSpot = app.activeDocument.spots.add();
// Define the new SpotColor as 80% of the RGB color
newSpot.name = "Scripted Red spot";
newSpot.tint = 80;
newSpot.color = newRGBColor;
// Apply a 50% tint of the new spot color to the frontmost path item.
// Create a spotcolor object, set the tint value,
var newSpotColor = new SpotColor();
newSpotColor.spot = newSpot;
newSpotColor.tint = 50;
// Use the spot color to set the fill color
var frontPath = app.activeDocument.pathItems[0];
frontPath.filled = true;
frontPath.fillColor = newSpotColor;
}

[792491914]

这才是专色

if ( app.documents.length > 0 ){
var doc = app.activeDocument;
// Create the new spot
var newSpot = doc.spots.add();
// Define the new color value
var newColor = new CMYKColor();
newColor.cyan = 35;
newColor.magenta = 0;
newColor.yellow = 50;
newColor.black = 0;
// Define a new SpotColor with an 80% tint
// of the new Spot's color. The spot color can then
// be applied to an art item like any other color.
newSpot.name = "Pea-Green";
newSpot.colorType = ColorModel.SPOT;
newSpot.color = newColor;
var newSpotColor = new SpotColor();
newSpotColor.spot = newSpot;
newSpotColor.tint = 80;
}

[木棉树下]

是要指定colorType出来才是专色，人家那指南也说了只是一些片段，不一定运行起来都对，疏漏在所难免