v-if =“books.length == 0“當books數組不為時,books . length = = 0布爾值為false,即v-if =‘false‘,並且不顯示table
v-if =“books.length“當books數組不為時,books . length的布爾值為true,即v-if =‘true‘,並顯示table
當您刪除壹個元素並且books為空時,books.length的布爾值為false,即v-if =‘false‘,並且table被隱藏;
以上就是答題過程,希望對妳有幫助!