[jialan75]

//代码摘自 CPC 论坛 与 Illustrator_JavaScript_Scripting_Reference_2017.pdf
//选择内容 另存为
//注意目录需要自己设置一下，如果路径非法就不会保存了
var doc = app.activeDocument;
var selection = doc.selection;
if(selection){
var box = getMaxWAndMaxH(selection);
//"C:/Users/Administrator/Desktop/2.pdf" 这行需要自己定义一下
savePdf("C:/Users/Administrator/Desktop/2.pdf",box.right-box.left,box.top-box.bottom)
}
//获取最大坐标
function getMaxWAndMaxH(selection){
var maxLeft = 0;
var maxTop = 0;
var maxRight = 0;
var maxBottom = 0;

var k =0;
for(i=0;i<selection.length;i++){
//if(selection[i].filled||selection[i].stroked)){
k++;
if(k==1){
var maxLeft = selection[i].geometricBounds[0];
var maxTop = selection[i].geometricBounds[1];
var maxRight = selection[i].geometricBounds[2];
var maxBottom = selection[i].geometricBounds[3];
}else{
var maxLeftTemp = selection[i].geometricBounds[0];
var maxTopTemp = selection[i].geometricBounds[1];
var maxRightTemp = selection[i].geometricBounds[2];
var maxBottomTemp = selection[i].geometricBounds[3];
maxLeft = maxLeft<maxLeftTemp?maxLeft:maxLeftTemp;
maxTop = maxTop>maxTopTemp?maxTop:maxTopTemp;
maxRight = maxRight>maxRightTemp?maxRight:maxRightTemp;
maxBottom = maxBottom<maxBottomTemp?maxBottom:maxBottomTemp;
}

//}

}
return {left:maxLeft,top:maxTop,right:maxRight,bottom:maxBottom};
}
//剪切 新建文档 黏贴 另存
function savePdf(dest,w,h){
app.executeMenuCommand('cut');
var u= 1
var docPreset = new DocumentPreset;
docPreset.units = RulerUnits.Millimeters;
docPreset.width = w* u; //更改新文档宽
docPreset.height = h * u; //更改新文档高
var docRef = app.documents.addDocument(DocumentColorSpace.CMYK, docPreset);
app.executeMenuCommand('paste');
var saveName = new File ( dest );
saveOpts = new PDFSaveOptions();
//saveOpts.pDFPreset = "[最小文件大小]"; //这是PDF的选项 看图
docRef.saveAs( saveName, saveOpts );
}

[jialan75]

//saveOpts.pDFPreset = "[最小文件大小]"; //这是PDF的选项 看图
前面的斜杠有没有删除