screen_rotation
Copied to Clipboard
<!DOCTYPE html> <html> <head> <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script> </head> <body> <div id="app"> <h3>Vue Js Check Array is undefined</h3> <p v-if="myArray === undefined">The array is undefined.</p> <p v-else-if="myArray.length === 0">The array is empty.</p> <p v-else>The array has {{ myArray.length }} items.</p> </div> <script> new Vue({ el: '#app', data() { return { myArray: undefined }; }, }); </script> </body> </html>