/*第一种方式
var hash ={
key :value,
"hello":true,
"node":true,
"world":true
};*/
function unique() {
var arr = ["hello","world","node","hello","node","node","node","hello","world","momo"];
var result = [], hash = {};
for (var i = 0, elem; (elem = arr[i]) != null; i++) {
if (!hash[elem]) { // . []
result.push(elem);
hash[elem] = true;
}
}
return result;
}
unique();
console.timeEnd("tag1");
console.time("tag2");
//第二种方法
function quchong(){
var arr = ["hello","world","node","hello","node","node","node","hello","world","momo"];
var arr2 =[];
for(var i=0;i<arr.length;i++){
if(arr2.indexOf(arr[i]) <0){
arr2.push(arr[i]);
}
}
return arr2;
}
quchong();
console.timeEnd("tag2");
console.time("unique");
console.timeEnd("unique");
console.time("quchong");
console.timeEnd("quchong")
转载请注明原文地址: https://ju.6miu.com/read-1305593.html
