我有一个长度为X的文件，它正在被一个长度为X-Y的字符串覆盖。问题是，该文件仍然保留X-Y之后的信息，因此它与第一个较长的文件一样长。所以这里是我适合的测试输出:文件开始于:{"sOption1":"String","nOption2":23.5,"sOption3":"String","bOption3B":true,"anOption4":[5,6,7],"sNewString":"FruitSalad","bNewBoolean":false,"iNewNumber":14.2,"anNewArray":[1,2,3,4,5,6,7,8,9,10],"oNewObject":{"