Javascript code freezes the browser -

i'm trying make function generates duplicated css properties html class use. function works in 3 steps.

1 - console, create object :

var obj = new module('prefix', 'suffix'); 

2- add couple of properties :

obj.addproperty('width', 'px', 2); obj.addproperty('height', 'px', 2); 

3 - run cloning process :

obj.clone('15', '3'); 

but than, freezes no apparent reason. here's full code :

<script> window.cloner_module = function(prefix, suffix) {     this.properties = []     this.prefix = prefix;     this.suffix = suffix;      this.addproperty = function(option, type, side) {         var array = [];         array.push(option, type, side);         this.properties.push(array);     }      this.clone = function(max, step) {          var array = [];         var entry_count = 0;         var innermodulearray = [];         var modulearray = [];         var property;         var option;         var type;         var side;         var value;         var string = "";           (var = 0; < max; + step) {             innermodulearray = [];             modulearray = [];             modulearray.push('.' + prefix + + suffix + '{');              (var y = 0; y < this.properties.length; y++) {                 property = this.properties[y];                 option = property[0];                 type = property[1];                 side = property[2];                 value;                  if (!side) {                     value = i;                 } else if (side == '1') {                     value = type + i;                 } else if (side == '2') {                     value = + type;                 } else {                     console.log('"side" property must between 0 , 2');                 }                  string = option + ": " + value + "; ";                 innermodulearray.push(string);             }              modulearray.push(innermodulearray);             modulearray.push('}');             array.push(modulearray);             entry_count++;         }          this.clones = array;         this.last_entry_count = entry_count;         this.last_step_registered = step;          this.last_max_registered = max;     } } </script> 

your code entering infinite loop result of for loop, in turn causing browser freeze. core problem line:

for (var = 0; < max; + step) 

here final statement equal 3 (0 + 3), loop never finish. want change to:

for (var = 0; < max; += step) 

this edit continuously increase i step each iteration, original intention.