let numberArray = [1,2,3,4,5,6,7,8,9]; let oddNumbers = numberArray.filter((value, index, array) => { if(value % 2){ console.log(value); return value; } }); 为了更好地理解它,我们来分解一下。该数组只是一组从 1 到 9 的数字。下一行是保存filter方法结果的变量。这和你之前做...
first: element inserted at the beginning of array last: element inserted at the end of array. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 functionappend(array,toAppend){constarrayCopy=array.slice();if(toAppend.first){arrayCopy.unshift(toAppend.first);}if(toAppend.last){arrayCopy.push(...
ECMAScript 2023 规范最近已经定稿,其中提出的 Array 对象新方法将为 JavaScript 带来更好的可预测性和可维护性。toSorted、toReversed、toSpliced 和 with 方法允许用户在不更改数据的情况下对数据执行操作,实质是先制造副本再更改该副本。 变异与副作用 Array 对象总是有点自我分裂。sort、reverse 和 splice 等方...
Array.prototype.removeFirst =function() {for(let i = 0; i < numbers.length; i++) { numbers[i]= numbers[i + 1]; }//过滤掉最后一个 undefinednumbers =this.reIndex(this);returnnumbers; }; Array.prototype.reIndex=function(arr) { const newArr=[];for(let i = 0; i < arr.length; i...
numbers.foreach(function(x) { console.log(x % 2 == 0); }); 1. 2. 3. 使用for…of 循环迭代 用for 循环和 forEach 方法迭代数组 for (let n of numbers) { console.log(n % 2 == 0 ? "even" : "odd"); } 1. 2. 3.
Version numbers The version of each of Bootstrap's jQuery plugins can be accessed via the VERSION property of the plugin's constructor. For example, for the tooltip plugin: $.fn.tooltip.Constructor.VERSION // => "3.3.7" 未对禁用 JavaScript 的浏览器提供补救措施 Bootstrap 插件未对禁用 JavaSc...
1,2,3,4,5,6,7,8,9 You can use the function below to do that. functiongenerateArrayOfNumbers(numbers){return[...Array(numbers).keys()].slice(1)} generateArrayOfNumbers(numbers)will generate and return N-numbers that you pass to this function as a parameter. ...
constnumbers = [1,2,3,4,5];constslicedElementsToEnd = numbers.slice(2);console.log(slicedElementsToEnd);// [3, 4, 5] 3.复制数组: constoriginalArray = [1,2,3,4,5];constcopiedArray = originalArray.slice();console.log(copiedArra...
pop @array; #@array = (5,6),7被丢弃 1. 2. 3. 4. 若数组为空,则 pop什么也不做,直接返回undef。 push(@array, 0); push @array, 8; push @array,1..100; #@array得到100个新元素 @other = qw/9 0 2 1 0/; push @array, @others; ...
;//输出结果: undefinedconsole.log(typeofnull);//输出结果: object在上述示例中，typeof 检测nmull...