[20141121]JavaScript之Array常用功能汇总*:first-child {margin-top: 0 !important;
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//完美去除法:var arr=[1,3,2,2,11,4];
var arr1=[];
var arr2=arr.sort(function(a,b){return a-b;
}); //把数组进行排序var num=1;
for (var i=0;i<arr2.length;i++){if(arr2[i]!==arr2[(num++)]){arr1.push(arr[i]);}
}
console.log(arr1); 原文:http://www.cnblogs.com/weven/p/7183191.html
引用类型Object类型function a(num){if(num>3){a(--num); }console.log(num); }a(5);//如何创建对象的实例var obj1= new Object();console.log(obj1);obj1.name="吴琼";obj1.age=28;console.log(obj1.name+" "+obj1.age);//对象字面量语法 ,有点封装的感觉var obj2 = {name:"吴琼",age:28};var obj3 = {age:28,age_wo:30};console.log(obj3["age_wo"]);console.log(obj2.name+" "+obj2.age);function show(arg){var s="";if(ar...
JS的类型数组大体可分为3类:无符号整数、有符号整数、浮点数。Int8Array; Uint8Array; Uint8ClampedArray; Int16Array; Uint16Array; Int32Array; Uint32Array; Float32Array; Float64Array;基本上都可以望文生义,看名字就知道怎么回事。但是有一个例外 Uint8ClampedArray ,它与 Uint8Array 颇为相似,但又有所区别。因为颜色数据刚好都是符合8位二进制的无符号整数,所以这两个类型在处理Canvas绘图数据时常常用到。Uint8Clamp...
转载:http://blog.csdn.net/teresa502/article/details/7926796代码:// 删除数组中重复数据function removeDuplElem(array){ for(var i=0; i<array.length; i++){for(var j=i+1; j<array.length;j++){if(array[i]==array[j]){array = removeElement(j,array);//删除指定下标的元素i=-1;break;}} }return array;
}
//删除数组 用到的函数function removeElement(index,array){if(index>=0 && index<array.length){for(var i...
Patching ArrayGiven a sorted positive integer array nums and an integer n, add/patch elements to the array such that any number in range [1, n] inclusive can be formed by the sum of some elements in the array. Return the minimum number of patches required.Example 1:nums = [1, 3], n = 6Return 1.Combinations of nums are [1], [3], [1,3], which form possible sums of: 1, 3, 4.Now if we add/patch 2 to n...
JavaScript Array 对象Array 对象Array 对象用于在变量中存储多个值:var cars = ["Saab", "Volvo", "BMW"];第一个数组元素的索引值为 0,第二个索引值为 1,以此类推。更多有关JavaScript Array参考手册请参考 JavaScript Array 对象手册。Array 对象属性方法描述concat()连接两个或更多的数组,并返回结果。every()检测数值元素的每个元素是否都符合条件。filter()检测数值元素,并返回符合条件所有元素的数组。indexOf()搜索数组...
原文地址在使用js编程的时候,常常会用到集合对象,集合对象其实是一种泛型,在js中没有明确的规定其内元素的类型,但在强类型语言譬如Java中泛型强制要求指定类型。ES6引入了iterable类型,Array,Map,Set都属于iterable类型,它们可以使用for...of循环来遍历,都内置forEach方法。数组遍历普通遍历最简单的一种,也是使用频率最高的一种。let arr = [‘a‘,‘b‘,‘c‘,‘d‘,‘e‘]
for (let i =0; i <arr.length; i++) {conso...
题目: 1、得到 3000 到 3500 之内工资的人。 2、增加一个年龄的字段,并且计算其年龄。 3、打印出每个人的所在城市 4、计算所有人的工资的总和。测试数据: function getData() {var arr = [{id: 1,name: ‘ohzri‘,birth: ‘1999.09.09‘,city: ‘湖北‘,salary: 9379},{id: 2,name: ‘rqgfd‘,birth: ‘1999.10.28‘,city: ‘湖北‘,salary: 1060},{id: 3,name: ‘fwfsh‘,birth: ‘1999.09.17‘,city: ‘广西‘...
[ JavaScript中文参考手册 | JS 中的数组 Array 对象JS Array 对象中的fill()方法的定义和用法Array.fill()?函数用于使用给定的静态值填充数组。该值可用于填充整个数组,也可用于填充数组的一部分。JS Array 对象中的fill()方法浏览器的兼容性ChromeInter ExplorerFirefoxSafariOpera4512317.132JS Array 对象中的fill()方法的语法和例子Array fill()方法的语法:arr.fill(value, start, end)这里arr是要用静态值填充的数组。参数...
JS中数组Array的用法{转载}js数组元素的添加和删除一直比较迷惑,今天终于找到详细说明的资料了,先给个我测试的代码^-^var arr
= new Array();arr[0] = "aaa";arr[1] =
"bbb";arr[2] =
"ccc";//alert(arr.length);//3arr.pop();//alert(arr.length);//2//alert(arr[arr.length-1]);//bbbarr.pop();//alert(arr[arr.length-1]);//aaa//alert(arr.length);//1var arr2 = new
Array();//alert(arr2.length);//0arr2[0] =
"aaa";...
The join() method joins all elements of an array into a string. var name = ‘shane osbourne‘;var upper = name.split(‘ ‘) // [shane, osbourne]
.map(x => x.charAt(0).toUpperCase() + x.slice(1)) // [Shane, Osbourne]
.join(‘ ‘);console.log(upper); 原文:http://www.cnblogs.com/Answer1215/p/4862771.html
ArraysArrays are zero-indexed, ordered lists of values. They are a handy way to
store a set of related items of the same type (such as strings), though in
reality, an array can include multiple types of items, including other
arrays.To create an array, either use the object constructor or the literal
declaration, by assigning the variable a list of values after the
declaration.12345// A simpl...
首先看到 www.w3school.cn上的解释:http://www.w3school.com.cn/jsref/jsref_slice_array.asp定义和用法slice() 方法可从已有的数组中返回选定的元素。语法arrayObject.slice(start,end)参数描述start必需。规定从何处开始选取。如果是负数,那么它规定从数组尾部开始算起的位置。也就是说,-1 指最后一个元素,-2 指倒数第二个元素,以此类推。end可选。规定从何处结束选取。该参数是数组片断结束处的数组下标。如果没有指定该参数...
Generators allow you to use the yield * syntax to yield each iteration of nested iterable as part of the main iterations. This enables you to combine multiple arrays, strings, or any iterable with anything you want to yield from your main generator.
const abcs = ["A", "B", "C"]const reverseIterator = function* (array) {yield* arrayyield* array.map(letter => letter.toLowerCase())yield Math.random(...