Js integer string converted to amount type data of sample code

function zhen(str) {  
    var arr_1 = ["", "u62fe", "u4f70", "u4edf", "u4e07", "u4ebf"], arr_2 = ["", "u4e07", "u4ebf"];  
    var maskstr = arr_1.slice(1).join("");  
    var arr2 = ["u96f6", "u58f9", "u8d30", "u53c1", "u8086", "u4f0d", "u9646", "u67d2", "u634c", "u7396"];  
    var arr3 = new Array;  
    var arr = str.split("");  
    arr.reverse();  
    var _step_ = 4;  
    var _index_ = 0;  
    var int1 = 0, int2 = 0;  
    // var   
    for (var i = 0; i < arr.length; i++) {  
        _index_ = i;  
        int1 = _index_ % _step_;  
        int2 = parseInt(_index_ / _step_);  
        if (int2 > 0 & int1 == 0) {  
            if (maskstr.indexOf(arr3[arr3.length - 1]) != -1) {  
                arr3.pop();  
            }  
            arr3.push(arr_2[int2]);  
        }  
        if (arr[i] > 0) {  
            if (int1 > 0) {  
                arr3.push(arr_1[int1]);  
            }  
        }  
        arr3.push(arr2[arr[i]]);  
    }  
    arr3.reverse();  
    <SPAN style="FONT-FAMILY: Consolas, 'Lucida Console', monospace; WHITE-SPACE: pre-wrap; COLOR: rgb(0,128,255)">return arr3.join("");</SPAN>  
}  

Zhen (' 12345 ');

- >" Twelve thousand three hundred and forty five"