四十、操作数组不改变原数组的值

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getCurrentUserIds(){                 this.searchRequest("/trainingActivityAuditing/getCurrentUserIds").then(resp => {                     this.addForm.originatorName = resp.data.data;                     //部门id                     var val = [];                     debugger                     var arr = resp.data.data;<br>　　　　　　　　　　　　　　　　　　　　　　　　//slice会返回一个新数组，不会修改原数组                     val = arr.slice();                     val = val.splice(0,val.length-1)                     this.showId = val.join(",");                        })             },