Who can write lottery code in javascript? You can't draw the same symbol repeatedly. One is ten signs.

var arr = [ 1，2，3，4，5，6，7，8，9， 10]； //Ten labels, you can put any data.

Function getArr(arr){

var key = math . round(math . random()*(arr . length- 1))；

Return arr.splice (key,1); //Every time you draw one, you really take it out of the array. If there is one symbol missing from the array, it won't be repeated.

}

alert(getArr(arr)[0])；