一、删除数组中的某一项
function removeArrByValue (array, val) {
for (var i = 0; i < array.length; i++) {
if (array[i] == val) {
array.splice(i, 1);
break;
}
}
return array;
}
或者
function removeArrByValue (array, val) {
array.forEach((item,index)=>{
if(item==val){
array.splice(index, 1);
}
})
return array;
}
二、数组去重
封装的方法:
unique(arr) {
var list= [];
for (var i = 0; i < arr.length; i++) {
if (list.indexOf(arr[i]) == -1) {
list.push(arr[i]);
}
}
return list;
}
使用例子:
let masList=[1,3,2,5,6,12,31,45,2,3,4,5,1,8];
let gList = this.unique(masList);
console.log(gList); // 输出结果: [6,12,31,45,8]
三、数组对象和一般数组之间的转换
(1)将一般数组转为对象数组
封装的方法:
function changeArrObj(list){
let arrList = [];
for (let i in list) {
arrList.push(list[i]);
}
for (var i = 0; i < arrList.length; i++) {
var j = {};
j.id = i;
j.src = arrList[i];
arr.push(j);
}
return arr;
}
使用例子:
let imgList= [ "../../beehive-scenes.jpg_180x180xzq90.jpg_.webp", "../../180x180xzq90.jpg_.webp", "../../dgshop.jpg_180x180xzq90.jpg_.webp" ]
let arrs = changeArrObj(imgList);
console.log(arrs);
// 运行结果
/* *
[
{
id: 0,
src: "../../beehive-scenes.jpg_180x180xzq90.jpg_.webp"
},
{
id: 1,
src: "../../180x180xzq90.jpg_.webp"
},
{
id: 2,
src: "../../dgshop.jpg_180x180xzq90.jpg_.webp"
}
]
*/
(2)将数组对象转为一般数组
封装的方法:
/**
list 要转换的数组
check 组成新数组的每一项
*/
function changeArr(list,check){
let arrList = [];
for( let i = 0; i< list.length;i++) {
arrList.push(list[i].check);
}
return arrList;
}
使用例子:
let imgList= [
{
id: 0,
src: "../../beehive-scenes.jpg_180x180xzq90.jpg_.webp"
},
{
id: 1,
src: "../../beehive-scenes.jpg_180x180xzq90.jpg_.webp"
}
]
let arr = changeArr(imgList,src);
console.log(arr);
// 运行结果:
// [ "../../beehive-scenes.jpg_180x180xzq90.jpg_.webp", "../../beehive-scenes.jpg_180x180xzq90.jpg_.webp"]
四、给数组的每一项加前缀
封装的方法:
/**
* pre 要添加的前缀
* paramsList 要加前缀的数组
*/
addFirst(pre,paramsList) {
let arr = [];
for (let i = 0; i < paramsList.length; i++) {
arr.push(pre + paramsList[i]);
}
return arr;
}
使用例子:
let arr= ['aa.jpg','bb.jpg','cc.png','gg.png'];
let newArr = addFirst("http://",arr);
console.log(newArr); // 运行结果: ['http://aa.jpg','http://bb.jpg','http://cc.png','http://gg.png'];