var book = {    year:2004,    edition:1}Object.defineProperty(book,"year",{    get:function(){        return this.year    },    set:function(newVal){        if(newVal>2004){            this.year = newVal ;            this.edition += newVal - 2004 ;        }    }});book.year = 2005 ;console.log(book.edition)如上所示，直接運(yùn)行會(huì)報(bào)錯(cuò) Maximum call stack size exceededat Object.set [as year]但是如果在year前面加個(gè)標(biāo)識(shí)符或者別的字母，就沒什么問題，哪位可以解答一下？