2) 使用 JavaScript Array unshift() 方法将多个元素添加到数组中 以下示例使用 unshift() 方法在数组的开头添加两个元素: letnumbers = [30,40];constlength = numbers.unshift(10,20);console.log({ length });console.log(...
❮PreviousJavaScript ArrayReferenceNext❯ Example Add new elements to an array: constfruits = ["Banana","Orange","Apple","Mango"]; fruits.unshift("Lemon","Pineapple"); Try it Yourself » Description Theunshift()method adds new elements tothe beginningof an array. ...
array.unshift(item) 方法可向数组的开头添加一个或更多元素,并返回新的长度。a 句法: 1 array.unshift(item1,item2, ..., itemX) 参数 item1,item2, ...,itemX :可选。向数组起始位置添加一个或者多个元素。 返回值: 描述Number 数组新长度。 JS Array 对象中的array.unshift()方法浏览器的兼容性 js...
The unshift() method adds new items to the beginning of an array, and returns the new length.Note: This method changes the length of an array.Tip: To add new items at the end of an array, use the push() method.Browser Support
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返回JavaScript Array 对象参考手册 (目录) 定义和用法 unshift() 方法可向数组的开头添加一个或更多元素,并返回新的长度。 语法 arrayObject.unshift(newelement1,newelement2,...,newelementX) 返回值 arrayObject 的新长度。 说明 unshift() 方法将把它的参数插入 arrayObject 的头部,并将已经存在的元素顺次...
一、数组转字符串 需要将数组元素用某个字符连接成字符串,示例代码如下: 1 2 3 4 vara, b,c; a =newArray(a,b,c,d,e); b = a.join('-');//a-b-c-d-e 使用-拼接数组元素 c = a.join('');//abcde 二、字符串转数组 实现方法为将字符串按某个字符切割成若干个字符串,并以数组形式返回...
Array literal (array literal) should be the most commonly used creation method in JavaScript, and it is quite convenient when initializing arrays. An array literal is a comma-separated list of elements enclosed in square brackets. const users = ['LiuXing', 'liuixng.io']; ...
JavaScript unshift() 方法 定义和用法 unshift() 方法可向数组的开头添加一个或更多元素,并返回新的长度。 语法 arrayObject.unshift(newelement1,newelement2,...,newelementX) 参数描述 返回值 arrayObject 的新长度。 说明 unshift() 方法将把它的参数插入 arrayObject 的头部,并将已经存在的元素顺次地移到较...
The shift() method returns the string that was "shifted out". The unshift() method returns the new array length. Changing Elements Array elements are accessed using theirindex number: Arrayindexesstart with 0. [0] is the first array element, [1] is the second, [2] is the third ... ...