JavaScript를 사용하여 Illustrator에서 심볼 라이브러리를로드하는 방법은 무엇입니까?

First off, it will be useful to know for clarity that a SymbolItem is a placed instance of a Symbol and a Document has both of those.

Illustrator will not allow a call to Document.symbolItems.add() if the symbol being passed is not in that document's symbols list. Personally, I consider that a bug. Here is a wrapper class that opens the symbol library as a new document (note the exclusion of relevant openAs property), places the symbol into that document, then copies the symbol item to the other document.

#target illustrator-18


//class
function SymbolLibrary(){

    this.symbolsDoc = null;
    this.len = 0;

    this.begin = function(symbolFileName){
        var file1 = File(symbolFileName);
        //open the symbol library
        var optRef = new OpenOptions();
        //optRef.openAs = LibraryType.SYMBOLS; //broken. just open as regular doc
        this.symbolsDoc = app.open( file1 , null , optRef);
        this.len = this.symbolsDoc.symbols.length;
        return this.symbolsDoc;
    }

    this.list = function(){
        for(var i=0;i<symbolsDoc.symbols.length;i++){
            $.writeln( symbolsDoc.symbols[i] );
        }
        return symbolsDoc.symbols;
    }

    this.place = function(targetDoc,index){
        var symbolItem = this.symbolsDoc.symbolItems.add(this.symbolsDoc.symbols[index]);
        finalItem = symbolItem.duplicate( targetDoc,ElementPlacement.PLACEATEND );
        symbolItem.remove();
        return finalItem;
    }

    this.end = function(){
    this.symbolsDoc.close(SaveOptions.DONOTSAVECHANGES);
    }
}

var filename =  "/Applications/Adobe\ Illustrator\ CC\ 2014/"+
    "Presets.localized/en_US/Symbols/Nature.ai";


//create new document
var mydoc = app.documents.addDocument('',new DocumentPreset());

//instantiate the symbol library handler class
var lib1 = new SymbolLibrary();

lib1.begin(filename);
for(var i=0;i<lib1.len;i++){
    lib1.place(mydoc,i).position = [((i%10)*100),i*10];
}
lib1.end();

$.writeln('#########');