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function nzBool(val, def_val) {
	var ret_val = val;

	if (typeof def_val == "undefined" || def_val === null || def_val.length === 0) {
		def_val = false;
	}

	if (typeof(val) == "undefined" || val === null || val.length === 0)
		ret_val = def_val;
	else if (typeof(val) == 'number')
		ret_val = val == 1;
	else if (typeof(val) == 'string')
		ret_val = val == '1' || val == 'true';
	else if (typeof(val) == 'boolean')
		ret_val = val;
	else
		ret_val = def_val;

	return ret_val;
}