var str = "0/1/2/3/4/5/6/7/8/9/10"; alert(Function('return ' + str.replace(/\//g, "+"))());
var s = "0/1/2/3/4/5/6/7/8/9/10", result = 0; s.split('/').forEach(function(i){ result += parseInt(i) }); alert(result);
var str = "0/1/2/3/4/5/6/7/8/9/10", str = str.split("/"), len = str.length; alert((str[0] + str[len - 1]) * len / 2);
var s = "0/1/2/3/4/5/6/7/8/9/10", result = 0; s.replace(/\d+/g,function(d){ result += parseInt(d,10) }); alert(result);