如何去掉数组两边的引号

如图，肉眼可见红色线的数据FJ1的属性值是数组外包裹字符串，
如果想取字符串的数组，可以用以下方法：
var str = "[{"name":"2.pdf","url":"/common/Pdf?Src=CF34830A662A49C98BC2D4C627134A6F.pdf"},{"name":"4.pdf","url":"/common/Pdf?Src=03D461DB80D843C2B38E7D390EE72419.pdf"},{"name":"5.pdf","url":"/common/Pdf?Src=B8F85D05E91941E38FC4CBF3EBCAC930.pdf"}]"
JSON.parse(str)