「JS — 操作」更新中

数组中是否存在某值

1arr.indexOf('XXX') // 不存在返回-1，存在返回该值坐标

截取字符串圆括号中的内容

1var source = 'url(XXX)'
2var res = /(.+)?(?:\(|（)(.+)(?=\)|）)/.exec(source)
3console.log(res[2]) // XXX

字符串转json && json转字符串

1JSON.parse()
2JSON.stringify()

获取json对象的属性/值

1var myObj = { "name": "小和", "color": "yellow", "age": "16" }
2for (x in myObj) {
3    console.log(x)//name,color,age
4    console.log(myObj[x])//小和,yellow,16
5}

json对象数组的增删改属性/值

1 let data = [{
2     name: '小志',
3     color: 'blue',
4     age: '16',
5 }, {
6     name: '小雅',
7     color: 'green',
8     age: '16',
9}]
10// 增
11for (var i = 0; i < data.length; i++) {
12	data[i].add='sex'
13}
14// 删
15for (var i = 0; i < data.length; i++) {
16	delete data[i]["age"]
17}
18// 改
19data.forEach(function(item) {
20	item.age= "18"
21})

排序

1function shuffle(arr) {
2	for (let i = arr.length - 1; i >= 0; i--) {
3		let rIndex = Math.floor(Math.random() * (i + 1));
4		let temp = arr[rIndex];
5		arr[rIndex] = arr[i];
6		arr[i] = temp;
7	}
8	return arr;
9}
10shuffle(Values)