javascript - Change value of Tag in LocalStorage -


i have localstorage xml called classification save name of teams , points.

i want go tag points , change value on time add new result.

my localstorage is:

 <classification><classification id="1"><name>sl benfica</name><points>0</points ></classification> <classification id="2"><name>fc porto</name ><points>0</points></classification> <classification id="3"><name>sporting cp</name><points>0</points></classification> <classification id="4"><name>sc braga</name><points>0</points></classification> </classification>

i want read value of points , add +3 when add new result of game.

javascript:

if (localstorage.classification){      parser = new domparser();      var doc =parser.parsefromstring(localstorage.classification,"text/xml");     var n = doc.getelementsbytagname("classification")[0].childnodes.length;     var = 0; }  (i = 0; < n; i++) {      elem = doc.getelementsbytagname("classification")[0].childnodes[i];     equipaclassificacao = elem.getelementsbytagname("name")[0].firstchild.nodevalue;     if (resultgame == 1) {              pointsg = number(elem.getelementsbytagname("points")[0].firstchild.nodevalue);              pointsg += 3;      }  }

someone know how resolve this?


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