DouKaku?

function komachi() {
  var list = Array.prototype.slice.apply(arguments, [0]);
  var right = list.pop();
  var operator = ["", "+", "-", "*", "/"];
  var n = Math.pow(operator.length,list.length-1);

  for(var i=0; i<n; i++) {
    var exp = [list[0]];
    var o = (n+i).toString(5);
    for(var j=1, ii=i; j<list.length; j++) {
      exp.push(operator[o.slice(j,j+1)]);
      exp.push(list[j]);
      ii = Math.floor(i/5);
    }
    if(eval(exp.join("")) == right) print(exp.join("") + '=' + right);
  }
}
print("begin");
komachi(1,2,3,4,5,6,7,8,9,100);
print("end");