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JavaScript | 数组的常用属性和方法
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JavaScript | 数组的常用属性和方法
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JavaScript的通用屬性和數(shù)組方法 (Common properties and methods of array in JavaScript )
| array.length | Returns the length of the array/total number of elements of the array |
| array[index] | Returns the item name stored at “index” position |
| array.push(item) | Inserts item at the end of the array |
| array.unshift(item) | Inserts item at the front of the array |
| array.pop() | Removes item from the end of the array |
| array.shift() | Removes item from the end of the array |
| array.indexOf(item) | Returns the index of the item |
| array.splice(index,1)) | Removes item from the list (index must be provided) |
| array.length | 返回數(shù)組的長度/數(shù)組中元素的總數(shù) |
| 數(shù)組[索引] | 返回存儲在“索引”位置的項目名稱 |
| array.push(item) | 在數(shù)組末尾插入項目 |
| array.unshift(項目) | 在數(shù)組的前面插入項目 |
| array.pop() | 從數(shù)組末尾刪除項目 |
| array.shift() | 從數(shù)組末尾刪除項目 |
| array.indexOf(item) | 返回項目的索引 |
| array.splice(index，1)) | 從列表中刪除項目(必須提供索引) |
Code:
碼：
<html><head><script>var fruits = ["apple","mango","banana","grapes","guava"];</script></head><body><script>document.write("<h3>List Of Array Items</h3>")document.write("<hr />");document.write("<ul>");for(var i=0;i<fruits.length;i++){document.write("<li>"+fruits[i]+"</li>");}document.write("</ul>");document.write("<hr />")var size=fruits.length;document.write("Size of Array : "+size+"<br />");var first = fruits[0];document.write("First Item of Array : "+first+"<br /><br />");fruits.forEach(function(item,index,array){document.write("Fruits["+index+"] = "+item+"<br />");});//Insert Item at lastfruits.push("orange");document.write("<br />")fruits.forEach(function(item,index,array){document.write("Fruits["+index+"] = "+item+"<br />");});//Insert Item at Frontfruits.unshift("cherry");document.write("<br />")fruits.forEach(function(item,index,array){document.write("Fruits["+index+"] = "+item+"<br />");});//Remove Item from Lastfruits.pop();document.write("<br />")fruits.forEach(function(item,index,array){document.write("Fruits["+index+"] = "+item+"<br />");});//Remove Item from Frontfruits.shift();document.write("<br />")fruits.forEach(function(item,index,array){document.write("Fruits["+index+"] = "+item+"<br />");});//Finding Index of Itemvar index = fruits.indexOf("banana");document.write("<br />");document.write("Index of banana : "+index+"<br />");//Removing any item from Listdocument.write("<br />");var pos = fruits.indexOf("banana");fruits.splice(pos,1)fruits.forEach(function(item,index,array){document.write("Fruits["+index+"] = "+item+"<br />");});</script></body> </html>Output
輸出量
List Of Array Items apple mango banana grapes guava Size of Array : 5 First Item of Array : appleFruits[0] = apple Fruits[1] = mango Fruits[2] = banana Fruits[3] = grapes Fruits[4] = guavaFruits[0] = apple Fruits[1] = mango Fruits[2] = banana Fruits[3] = grapes Fruits[4] = guava Fruits[5] = orangeFruits[0] = cherry Fruits[1] = apple Fruits[2] = mango Fruits[3] = banana Fruits[4] = grapes Fruits[5] = guava Fruits[6] = orangeFruits[0] = cherry Fruits[1] = apple Fruits[2] = mango Fruits[3] = banana Fruits[4] = grapes Fruits[5] = guavaFruits[0] = apple Fruits[1] = mango Fruits[2] = banana Fruits[3] = grapes Fruits[4] = guavaIndex of banana : 2Fruits[0] = apple Fruits[1] = mango Fruits[2] = grapes Fruits[3] = guava翻譯自: https://www.includehelp.com/code-snippets/common-properties-and-methods-of-array-in-javascript.aspx
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