//用某个字符切割成数组

var str = "obj_str";

var arr = str.split('_');

//arr = ['obj','str'];

//获取对象的属性

YanXG.fileType = {

image: ['jpg','gif','png'],

word: ['doc','docx'],

excel:['xls','xlsx'],

video:['mp4','avi','3gp']

}

var keys = Object.getOwnPropertyNames(YanXG.fileType);

//keys = [image,word,excel,video];