查找所有子字符串的所有位置

var str = "adadfdfseffqdjhuserfsefseetsdg";//字符串
var search = "fse";//要找的子串

function searchSubStr(str, search){
  var pos = [];
  var index = str.indexOf(search);//开始找，找到了，while循环继续找
  while(index > -1){
    pos.push(index);
    index = str.indexOf(search, index+1);//在找到的下一个位置上又开始找，直到找不到了，退出；
  }
  return pos;
}

console.log(searchSubStr(str, search));//[6, 19, 22]