warpwallet cracker

x.js

function getRandomPassword(length) {
    var charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    var result = "";
    if (window.crypto && window.crypto.getRandomValues) {
        values = new Uint32Array(length);
        window.crypto.getRandomValues(values);
        for(var i=0; i<length; i++) {
            result += charset[values[i] % charset.length];
        }
        return result;
    } else throw new Error("Your browsercan't generate secure random numbers");
}

function crack() {
      var start = new Date().getTime();
      var candidate = getRandomPassword(8);
      warpwallet.run({
            	passphrase: candidate,
            	salt: 'a@b.c',
            	progress_hook: null,
            	params: window.params},
            	function(res) {   
            		if(res['public'] == '1MkupVKiCik9iyfnLrJoZLx9RH4rkF3hnA'){
            			console.log("Found private key " + res['private'] + " and password " + candidate);
            		} else {
            		      var end = (new Date().getTime() - start) / 1000;
            		      console.log(res['public'] + " / " + candidate + " in " + end + "s");
            		      crack();
            		}
      	      });

}

crack();

Hello How to Run this, Please HELP