let dataSource = []; menuList.map((item, index) => dataSource.push({ key: item.type, rank: index + 1, text: item.text, type: item.type, icon: item.icon, status: item.status }) ); if you ...
I want to create an array of length 15 where the first five items are the contents of another one-dimensional array, and the following array values are specified by me (such as empty) let arr1 = new Array(5) arr2.map((x)=>{ arr1.unshift(x) }) r...
function duplicates(arr) { var obj = {}; var newArr = []; for (var i in arr){ if(obj[arr[i]]){ obj[arr[i]]PP; } else{ obj[arr[i]]=1; } } ...
Integer a = 1; Integer b = 2; Long c = 3L; c = a compiler error will result in the error that int cannot be converted to long System.out.println (compiled normally, resulting in true Why? I know that when int and long add up, they both turn i...
div v-for="(item,i) in dataList" :key="i" class="wrapper"> <div class="top-title" :id="item.id"> <div class="name">{{item.product}}< div> <div class=&...
problem description how do I add moving content to the target box when using React dnd to implement drag and drop? related codes Container.js <Source name={item.name} key={item.id} id={item.id} index={index} icon={item.icon} > Source.js ...
The principle of instanceof to detect whether an object An is an instance of another object B is to see if the object pointed to by the prototype of object B is on the [[prototype]] chain of object A. That "".__proto__===String.prototype true...
<input v-on:input= submit type="text" placeholder="" @keydown="handleInput" v-model.trim="info.inviteCode"> handleInput(e) { if( [^ d] .test(this.info.inviteCode)){ con...