js-版本判断

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versionCompare = function(left, right) {
    if (typeof left + typeof right != 'stringstring')
        return false;
    
    var a = left.split('.')
    ,   b = right.split('.')
    ,   i = 0, len = Math.max(a.length, b.length);
        
    for (; i < len; i++) {
        if ((a[i] && !b[i] && parseInt(a[i]) > 0) || (parseInt(a[i]) > parseInt(b[i]))) {
            return 1;
        } else if ((b[i] && !a[i] && parseInt(b[i]) > 0) || (parseInt(a[i]) < parseInt(b[i]))) {
            return -1;
        }
    }
    
    return 0;
}