log('loop'); return item.length>4; }) result2; // -1基本方法之 - 操作#对原数组无影响join , 将数组元素用特定的字符( 默认为逗号)拼接成字符串 => Stringvar arr = [1,2,3,4] var str1 = arr.join(); console.log(str1); // '1,2,3,4' var str2 = arr.join('&'); console...
如下：// 第一种写法constarr=newArray(10)// 不缓存for(vari=0;i<arr.length;i++){}Constructr...
let result=[]; loop:for(let i = 0,n = target.length;i < n; i++) {for(let x = i + 1;x < n;x++) {if(target[x] ===target[i]) {continueloop; } } result.push(target[i]); }returnresult; }/** * 去重操作,无序状态,效率最高 * 都会转换为字符串 * @param target * @...
The example loops over the array of words with the classic for loop. for (let i=0; i<words.length; i++) { The i variable is the auxiliary counter value. We determine the size of the array with the length property. In the first phase, we initiate the counter i to zero. This ...
Example 2: Using Array length in for loop varlanguages = ["JavaScript","Python","C++","Java","Lua"];// languages.length can be used to find out// the number of times to loop over an array for(i =0; i < languages.length; i++){ ...
or the classical for loop var items = ['one','two','three'] for(var i=0,l=items.length; i < l ; i++){ console.log(items[i]); } // logs: 'one','two','three' eg8: var myStringArray = ['Hello', 'World']; // array uses [] not {} ...
JavaScript – Create array JavaScript – Array length JavaScript – Access elements of array using index JavaScript – Loop over an Array JavaScript – Array forEach() JavaScript – Join elements of array to a string JavaScript – Add element to starting of array JavaScript – Add element to end...
例如,我知道如何使用 JavaScript for 循环在数组中循环,但我仍然不明白 array.length -1 是什么意思,特别是 -1 部分。 当在数组上使用 for 循环时,我们有这样的事情: for (i = 0; i < array.length; i++) {...} 但我有时也看到过这样的事情: for (i = 0; i < array.length - 1; i++)...
and the last element is backward next to the first element. Determine if there is a loop in t...
当我将array.length存储在变量中并使用操作符<=应用于for循环条件时，循环工作得很好，但是当我在同一...