一、数组去重
var arr = [0,1,20,3,0,45,6,0];
Array.prototype.unrepeat = function(){
var array = [];
for(var i = 0;i<this.length;i++){
if(array.indexOf(this[i]) === -1){
array.push(this[i]);
}
}
return array;
}
console.log(arr.unrepeat());
二、数组排序
var arr = [1,5,9,4,8,7]
arr = arr.sort(function(a,b){return a-b}) // 升序
console.log(arr);
三、数组对象的排序
var arr = [{id:1},{id:7},{id:5},{id:9},{id:20},{id:3}]
arr = arr.sort(function(a,b){return a.id - b.id})
console.log(arr)
四、字符串转换数组的小方法
1)eval():
var arr = "[1,2,3,4,5]";
console.log(eval(arr)) // 性能较差
2)JSON.parse();
var arr = "[1,2,3,4,5]";
console.log(JSON.parse(arr))
3)es6的Array.of()
console.log(Array.of(1,2,3,4,8))
console.log(Array.of("a","b","c","d"))
4)非字符串数组格式的字符串转化成数组
var arr = "1,2,3,4,5";
arr = "["+arr+"]"
console.log(JSON.parse(arr),eval(arr));
五、数组转化成字符串
1)toString()
var arr = ["Creek","Sinoshy","Stream"]
console.log(arr.toString()) // 以“,”作为分隔符
2)join()
var arr = ["Creek","Sinoshy","Stream"]
console.log(arr.join()) // 默认以逗号分隔,如果给参数,那么会根据给的参数进行分隔
六、删除两个数组中相同的元素
let arr1 = [1,5,7];
let arr2 = [1,2,3,4,5,6,7]
for(let i = 0;i < arr1.length;i ++){
for(let x = 0;x < arr2.length;x ++){
if(arr1[i] === arr2[x]){
arr2.splice(x,1)
}
}
}
console.log(arr2)
原文地址:https://www.cnblogs.com/ywx354980-bk/p/9204457.html