发布订阅模式下的数组排序

<script>

let obj = {};

obj.arr = [];

function sortNum(a,b){

return a-b

}

obj.listen = function(fn){

obj.arr.push(fn)

};

obj.trigger = function(){

for(let i = 0;i<this.arr.length;i++){

obj.arr[i](...arguments)

}

}

obj.listen(function(...arguments){

arguments.sort(sortNum);

console.log(arguments)

})

let arr1 = [34,32,15,3,9,17]

obj.trigger(...arr1)

</script>